Bump to dotnet/java-interop@ccafbe6 (#9025)

Changes: dotnet/java-interop@f935001...ccafbe6

  * dotnet/java-interop@ccafbe6a: Revert "Update dotnet/android-tools submodule (#1228)" (dotnet/java-interop#1229)
  * dotnet/java-interop@25a06f65: Update dotnet/android-tools submodule (dotnet/java-interop#1228)
  * dotnet/java-interop@4cd57118: Update README.md (dotnet/java-interop#1227)

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