Bump to dotnet/android-tools@2609c38 (#1362)

Bumps [external/xamarin-android-tools](https://github.com/xamarin/xamarin-android-tools) from `31609ca` to `2609c38`.
- [Commits](dotnet/android-tools@31609ca...2609c38)

---
updated-dependencies:
- dependency-name: external/xamarin-android-tools
  dependency-version: 2609c38a8d3232ba24c4a70cb88be3f505dab5bd
  dependency-type: direct:production
...

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

Author: dependabot[bot]