Bump external/xamarin-android-tools from 7889061 to d4b5529

Bumps [external/xamarin-android-tools](https://github.com/dotnet/android-tools) from `7889061` to `d4b5529`.
- [Commits](dotnet/android-tools@7889061...d4b5529)

---
updated-dependencies:
- dependency-name: external/xamarin-android-tools
  dependency-version: d4b55297d023b648d261d0f0a4a2b99c79c9c747
  dependency-type: direct:production
...

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

Author: dependabot[bot]