fix: remove package name from androidManifest

[Mrllopes]

Description

In gradle 8 ou higher setting the namespace via the package attribute in the source AndroidManifest.xml is no longer supported.

Related Issues

*[Question]: #2611

Checklist

• [x] I read the Contributor Guide and followed the process outlined there for submitting PRs.
• [X] I titled the PR using Conventional Commits.
• [X] I did not modify the CHANGELOG.md nor the plugin version in pubspec.yaml files.
• [X] All existing and new tests are passing.
• [X] The analyzer (flutter analyze) does not report any problems on my PR.