Update dependency backdrop to v0.8.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
backdrop	dependencies	minor	0.1.8 -> 0.8.1

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Release Notes

fluttercommunity/backdrop

v0.8.1

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• DOCS: fix badge links
• CHORE: move to OSI-approved license

v0.8.0

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• FIX: SchedulerBinding.instance is now null-safe (#​124) (#​125)

v0.7.2

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• DOCS: remove mention of deprecated member
• REFACTOR: making BackdropScaffoldState.scaffoldKey non-null with late (#​114)
• FEAT: added frontLayerShape in-place of frontLayerBorderRadius in BackdropScaffold (#​116)
• PERF: only rebuild widgets when BackdropScaffoldState changed (#​119)

v0.7.1

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• DOCS: proper(short) first sentence of doc-comments (#​110)

v0.7.0

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• DOCS: added "Awesome Flutter" shield
• CHORE: migrated to flutter_lints with additional rules (#​99)
• CI: added check for proper PR title based on conventionalcommits.org (#​101)
• STYLE: fix all lint issues (#​100)
• DOCS: added api-doc links to quick links section
• BREAKING REFACTOR: removed all deprecated members (#​102)
• BREAKING REFACTOR: moved all files to src/ dir (#​103)
• DOCS: remove note for flutter v1 and minor formatting
• FEAT: synced members of Scaffold and AppBar (#​104)
• DOCS: start doc-comments with a single sentence summary (#​105)
• CI: using flutter analyze and checking correct formatting (#​107)
• FEAT: added double frontLayerElevation member (#​109)
• CI: restructured, cleaned, added pub.dev checks (#​108)
• CHORE: default gitignore for idea added

v0.6.2

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• doc: "all-contributors" generated through CLI
• doc(readme): minor - using HTML badges instead of MD
• ci(analysis): upgraded analyzer action to v3
• doc(readme): GIF for BackdropScaffold example updated

v0.6.1

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• BackdropScaffold: added maintainBackLayerState argument [#​93]

v0.6.0

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• pubspec: revert homepage to github repo
• dart: requires Dart >= 2.12 BREAKING [#​86]
• dart: opt-in for null safety [#​86]

v0.5.3

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• pubspec: set https://fluttercommunity.github.io/backdrop/ as "Home Page"
• readme: added "Live Demo" to "Quick links"
• BackdropScaffold: fix bug where _animationController.dispose() is not called correctly [#​83]

v0.5.2

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• example: referring "live demo" so that it shows up in pub.dev
• example: proper sdk constraints and migrated to Flutter Android Embedding v2
• ci-cd: deploy_demo fix
• BackdropScaffold: added revealBackLayerAtStart property [#​82]
• BackdropScaffold: renamed controller -> animationController property and state "getter" [#​82]

v0.5.1

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• readme: minor fix

v0.5.0

• demo: use gallerize package [#​67]
• demo: auto-deploy with new tag creation with Github Actions [#​69]
• dart: requires Dart >= 2.3 BREAKING [#​73]
• BackdropScaffold: added frontLayerActiveFactor and backLayerScrim; replaced inactiveOverlayColor with frontLayerScrim; [#​73]
• BackdropScaffold: documentation improvement for subHeader, headerHeight and stickyFrontLayer [#​73]
• example: added example for variable height front layer [#​73]
• BackdropScaffold: added reverseAnimationCurve [#​74]
• readme: added "Accessing underlying backdrop functionalities" section [#​77]

v0.4.7

• BackdropScaffold: added scaffoldKey [https://github.com/fluttercommunity/backdrop/pull/64](https://togithub.com/fluttercommunity/backdrop/pull/64)4]
• BackdropScaffold: added frontLayerBackgroundColor [https://github.com/fluttercommunity/backdrop/pull/63](https://togithub.com/fluttercommunity/backdrop/pull/63)3,[https://github.com/fluttercommunity/backdrop/pull/66](https://togithub.com/fluttercommunity/backdrop/pull/66)6]
• BackdropNavigationBackLayer: added itemPadding, itemSplashColor, itemSplashBorder [https://github.com/fluttercommunity/backdrop/pull/65](https://togithub.com/fluttercommunity/backdrop/pull/65)5]

v0.4.6

• _MeasureSize: removed _OnWidgetSizeChange in favour of ValueChanged<Size>
• _MeasureSize: fix: not working properly with Animation [https://github.com/fluttercommunity/backdrop/pull/57](https://togithub.com/fluttercommunity/backdrop/pull/57)7]
• BackdropScaffold: fix: layout issue for strict constraint backLayer [https://github.com/fluttercommunity/backdrop/pull/58](https://togithub.com/fluttercommunity/backdrop/pull/58)8]

v0.4.5

• BackdropScaffold: exposed key property [https://github.com/fluttercommunity/backdrop/pull/53](https://togithub.com/fluttercommunity/backdrop/pull/53)3]
• BackdropScaffold: fix: headerHeight not updating once built [https://github.com/fluttercommunity/backdrop/pull/52](https://togithub.com/fluttercommunity/backdrop/pull/52)2]

v0.4.4

• BackdropToggleButton: exposed color property of AnimatedIcon [https://github.com/fluttercommunity/backdrop/issues/48](https://togithub.com/fluttercommunity/backdrop/issues/48)8]
• BackdropScaffold: added all missing properties from material Scaffold [https://github.com/fluttercommunity/backdrop/pull/51](https://togithub.com/fluttercommunity/backdrop/pull/51)1]
• BackdropScaffold: added property inactiveOverlayOpacity.[https://github.com/fluttercommunity/backdrop/pull/51](https://togithub.com/fluttercommunity/backdrop/pull/51)1]

v0.4.3

• Demo app with use cases [https://github.com/fluttercommunity/backdrop/pull/37](https://togithub.com/fluttercommunity/backdrop/pull/37)7]
• BackdropNavigationBackLayer: directly expose separatorBuilder instead of separator [https://github.com/fluttercommunity/backdrop/pull/44](https://togithub.com/fluttercommunity/backdrop/pull/44)4]

v0.4.2

• fix toggle from front layer bug [https://github.com/fluttercommunity/backdrop/pull/41](https://togithub.com/fluttercommunity/backdrop/pull/41)1]

v0.4.1

• making _BackdropScaffoldState class public [https://github.com/fluttercommunity/backdrop/pull/36](https://togithub.com/fluttercommunity/backdrop/pull/36)6]

v0.4.0

• refactor backdrop.dart to smaller dart files [https://github.com/fluttercommunity/backdrop/pull/32](https://togithub.com/fluttercommunity/backdrop/pull/32)2]

v0.3.4

• subHeader attribute added to BackdropScaffold [https://github.com/fluttercommunity/backdrop/pull/29](https://togithub.com/fluttercommunity/backdrop/pull/29)9]
• BackdropSubHeader provided to implement sub header following MDG [https://github.com/fluttercommunity/backdrop/pull/29](https://togithub.com/fluttercommunity/backdrop/pull/29)9]

v0.3.3

• refactor showFrontLayer to concealBackLayer and showBackLayer to revealBackLayer [https://github.com/fluttercommunity/backdrop/pull/30](https://togithub.com/fluttercommunity/backdrop/pull/30)0]
• added onBackLayerConcealed and onBackLayerRevealed callbacks [https://github.com/fluttercommunity/backdrop/pull/30](https://togithub.com/fluttercommunity/backdrop/pull/30)0]

v0.3.2

• fix typo [https://github.com/fluttercommunity/backdrop/pull/27](https://togithub.com/fluttercommunity/backdrop/pull/27)7]

v0.3.1

• floatingActionButton and other related attributes to BackdropScaffold [https://github.com/fluttercommunity/backdrop/pull/21](https://togithub.com/fluttercommunity/backdrop/pull/21)1]

v0.3.0

• BackdropAppBar added [https://github.com/fluttercommunity/backdrop/pull/23](https://togithub.com/fluttercommunity/backdrop/pull/23)3]

v0.2.17

• animation duration fix [https://github.com/fluttercommunity/backdrop/pull/19](https://togithub.com/fluttercommunity/backdrop/pull/19)9]
• configurable inactive layer color with animating color change [https://github.com/fluttercommunity/backdrop/pull/20](https://togithub.com/fluttercommunity/backdrop/pull/20)0]
• Improve the front layer border radius [https://github.com/fluttercommunity/backdrop/pull/22](https://togithub.com/fluttercommunity/backdrop/pull/22)2]

v0.2.15

• bug fix: unfocusing keyboard before fling. [https://github.com/fluttercommunity/backdrop/pull/16](https://togithub.com/fluttercommunity/backdrop/pull/16)6]

v0.2.14

• Moved package from gitlab.com/daadu/backdrop to github.com/fluttercommunity/backdrop

v0.2.13

• Moved package to Flutter Community

v0.2.11

• Reverting to v0.2.9

v0.2.10

• Added documentation link in pubspec.yaml

v0.2.9

• Documentation of classes and attributes

v0.2.8

• disabling focus on backLayer when not visible

v0.2.7

• updated README.md

v0.2.1

• animation duration fix [https://github.com/fluttercommunity/backdrop/pull/19](https://togithub.com/fluttercommunity/backdrop/pull/19)9]
• configurable inactive layer color with animating color change [https://github.com/fluttercommunity/backdrop/pull/20](https://togithub.com/fluttercommunity/backdrop/pull/20)0]
• Improve the front layer border radius [https://github.com/fluttercommunity/backdrop/pull/22](https://togithub.com/fluttercommunity/backdrop/pull/22)2]

v0.2.0

• NavigationBackLayer widget - for easily implement navigation with backdrop
• stickyFrontLayer - dynamic height for backdrop - based on height of backLayer
• animationCurve for backdrop can be passed as parameter
• minor bug fixes

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