fix(alarm_manager_plus): removed import that broke build

[komaxx]

Description

Removes an import for the no longer existing io.flutter.view.FlutterNativeView class in Android.
This fixes build issues seen in Flutter starting with version 3.29.0.

Related Issues

Fix #3476

Checklist

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

Breaking Change

Does your PR require plugin users to manually update their apps to accommodate your change?

• Yes, this is a breaking change (please indicate that with a ! in the title as explained in Conventional Commits).
• No, this is not a breaking change.

[miquelbeltran]

Thanks for this! I need to fix CI first, seems that recent changes broke a lot of different things.

[miquelbeltran]

merged main in. I also saw the compile issues on the fixed CI branch.