Bump external/xamarin-android-tools from 37d79c9 to 05f9a90 (#1212)

Bumps [external/xamarin-android-tools](https://github.com/xamarin/xamarin-android-tools) from `37d79c9` to `05f9a90`.
- [Commits](dotnet/android-tools@37d79c9...05f9a90)

---
updated-dependencies:
- dependency-name: external/xamarin-android-tools
  dependency-type: direct:production
...

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