Bump flutter_launcher_icons from 0.11.0 to 0.12.0

Bumps [flutter_launcher_icons](https://github.com/fluttercommunity/flutter_launcher_icons) from 0.11.0 to 0.12.0.
- [Release notes](https://github.com/fluttercommunity/flutter_launcher_icons/releases)
- [Changelog](https://github.com/fluttercommunity/flutter_launcher_icons/blob/master/CHANGELOG.md)
- [Commits](https://github.com/fluttercommunity/flutter_launcher_icons/compare/v0.11.0...v0.12.0)

---
updated-dependencies:
- dependency-name: flutter_launcher_icons
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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