Update dependency url_launcher to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
url_launcher	dependencies	major	^5.7.10 -> ^6.0.0

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Release Notes

flutter/packages

v6.1.10

• Updates links for the merge of flutter/plugins into flutter/packages.

v6.1.9

• Updates minimum Flutter version to 3.0.
• Updates iOS minimum version in README.

v6.1.8

• Updates code for stricter lint checks.

v6.1.7

• Updates code for new analysis options.

v6.1.6

• Updates imports for prefer_relative_imports.
• Updates minimum Flutter version to 2.10.
• Fixes avoid_redundant_argument_values lint warnings and minor typos.

v6.1.5

• Migrates README.md examples to the code-excerpt system.

v6.1.4

• Adopts new platform interface method for launching URLs.
• Ignores unnecessary import warnings in preparation for upcoming Flutter changes.

v6.1.3

• Updates README section about query permissions to better reflect changes to
  canLaunchUrl recommendations.

v6.1.2

• Minor fixes for new analysis options.

v6.1.1

• Updates links for the merge of flutter/plugins into flutter/packages.

v6.1.0

• Introduces new launchUrl and canLaunchUrl APIs; launch and canLaunch
  are now deprecated. These new APIs:
  • replace the String URL argument with a Uri, to prevent common issues
    with providing invalid URL strings.
  • replace forceSafariVC and forceWebView with LaunchMode, which makes
    the API platform-neutral, and standardizes the default behavior between
    Android and iOS.
  • move web view configuration options into a new WebViewConfiguration
    object. The default behavior for JavaScript and DOM storage is now enabled
    rather than disabled.
• Also deprecates closeWebView in favor of closeInAppWebView to clarify
  that it is specific to the in-app web view launch option.
• Adds OS version support information to README.
• Reorganizes and clarifies README.

v6.0.20

• Fixes a typo in default_package registration for Windows, macOS, and Linux.

v6.0.19

• Updates README:
  • Adds description for file scheme usage.
  • Updates Uri class link to SDK documentation.

v6.0.18

• Removes dependency on meta.

v6.0.17

• Updates code for new analysis options.

v6.0.16

• Moves Android and iOS implementations to federated packages.

v6.0.15

• Updates README:
  • Improves organization.
  • Clarifies how canLaunch should be used.
• Updates example application to demonstrate intended use of canLaunch.

v6.0.14

• Updates readme to indicate that sending SMS messages on Android 11 requires to add a query to AndroidManifest.xml.
• Fixes integration tests.
• Updates example app Android compileSdkVersion to 31.

v6.0.13

• Fixed extracting browser headers when they are null error.

v6.0.12

• Fixed an error where 'launch' method of url_launcher would cause an error if the provided URL was not valid by RFC 3986.

v6.0.11

• Update minimum Flutter SDK to 2.5 and iOS deployment target to 9.0.
• Updated Android lint settings.

v6.0.10

• Remove references to the Android v1 embedding.

v6.0.9

• Silenced warnings that may occur during build when using a very
  recent version of Flutter relating to null safety.

v6.0.8

• Adding API level 30 required package visibility configuration to the example's AndroidManifest.xml and README
• Fix test button check for iOS 15.

v6.0.7

• Update the README to describe a workaround to the Uri query
  encoding bug.

v6.0.6

• Require url_launcher_platform_interface 2.0.3. This fixes an issue
  where 6.0.5 could fail to compile in some projects due to internal
  changes in that version that were not compatible with earlier versions
  of url_launcher_platform_interface.

v6.0.5

• Add iOS unit and UI integration test targets.
• Add a Link widget to the example app.

v6.0.4

• Migrate maven repository from jcenter to mavenCentral.

v6.0.3

• Update README notes about URL schemes on iOS

v6.0.2

• Fixes a typo in default_package registration for Windows, macOS, and Linux.

v6.0.1

• Updates README:
  • Adds description for file scheme usage.
  • Updates Uri class link to SDK documentation.

v6.0.0

• Migrate to null safety.
• Fix outdated links across a number of markdown files (#​3276)
• Update the example app: remove the deprecated RaisedButton and FlatButton widgets.
• Correct statement in description about which platforms url_launcher supports.

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