Bump to dotnet/android-tools@8a58f4f (#1427)

Bumps [external/xamarin-android-tools](https://github.com/xamarin/xamarin-android-tools) from `7d0e083` to `8a58f4f`.
- [Commits](dotnet/android-tools@7d0e083...8a58f4f)

---
updated-dependencies:
- dependency-name: external/xamarin-android-tools
  dependency-version: 8a58f4f57276a482cdd0f5cb1df7e24644f93db8
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]