Bump to xamarin/xamarin-android-tools/main@8bc07503

Changes: http://github.com/xamarin/xamarin-android-tools/compare/dbe42bf1688e79e1ca474dff4a1f8060158cafd9...8bc075035818e7731df79ec688e2c6b154a29b4f

  * dotnet/android-tools@8bc0750: [Xamarin.Android.Tools.AndroidSdk] Update platform-tools for API-T (dotnet/android-tools#203)

Author: jonpryor

.gitmodules

@@ -32,5 +32,5 @@
     branch = master
 [submodule "external/xamarin-android-tools"]
     path = external/xamarin-android-tools
-    url = https://github.com/dellis1972/xamarin-android-tools
-    branch = bumppt
+    url = https://github.com/xamarin/xamarin-android-tools
+    branch = main