Bump to xamarin/xamarin-android-tools/main@4889bf0 (#1172)

Changes: dotnet/android-tools@8d38281...4889bf0

  * dotnet/android-tools@4889bf0: [MSBuildReferences.projitems] Require opt-in to use `Microsoft.Build` (dotnet/android-tools#220)
  * dotnet/android-tools@21de3d7: [build] update $(MSBuildPackageReferenceVersion) to 17.6.3 (dotnet/android-tools#221)
  * dotnet/android-tools@08a6990: Bump android-sdk NDK version to 26.1.10909125
  * dotnet/android-tools@6ae1f2a: Bump android-sdk build-tool version to 34.0.0
  * dotnet/android-tools@184b6b3: Bump android-sdk cmdline-tools to version 11.0
  * dotnet/android-tools@1365e33: Bump android-sdk platforms-tools to version 34.0.5

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