Bump external/xamarin-android-tools from 7ec795c to 6575743

Bumps [external/xamarin-android-tools](https://github.com/xamarin/xamarin-android-tools) from `7ec795c` to `6575743`.
- [Commits](dotnet/android-tools@7ec795c...6575743)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]