Bump provider from 5.0.0 to 6.0.3

Bumps [provider](https://github.com/rrousselGit/provider) from 5.0.0 to 6.0.3.
- [Release notes](https://github.com/rrousselGit/provider/releases)
- [Changelog](https://github.com/rrousselGit/provider/blob/master/CHANGELOG.md)
- [Commits](rrousselGit/provider@v5.0.0...v6.0.3)

---
updated-dependencies:
- dependency-name: provider
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

pubspec.yaml

@@ -13,7 +13,7 @@ dependencies:
   google_fonts: ^3.0.1
   http: ^0.13.1
   image_picker: ^0.7.4
-  provider: ^5.0.0
+  provider: ">=5.0.0 <7.0.0"
   receive_sharing_intent: ^1.4.5
   shared_preferences: ^2.0.5
   flutter_svg: ^1.0.3