Bump dotnet/android-tools@6a6de1f (#1383)

Bumps [external/xamarin-android-tools](https://github.com/xamarin/xamarin-android-tools) from `e0a9393` to `6a6de1f`.
- [Commits](dotnet/android-tools@e0a9393...6a6de1f)

---
updated-dependencies:
- dependency-name: external/xamarin-android-tools
  dependency-version: 6a6de1f24572d93048f3bbaa997bcfcf43a472dd
  dependency-type: direct:production
...

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