Bump to xamarin/java.interop/main@bba1f077 (#5649)

Changes: dotnet/java-interop@b46598a...bba1f07

  * [Java.Runtime.Environment] Fix CS0436 warnings
  * [invocation-overhead] Fix; .NET Core support
  * [generator] Fix NRE when interfaces appear to implement classes.
  * [Java.Interop-Tests] Initial `dotnet test` support
  * [invocation-overhead] Fix CS0436 warnings
  * [ci] Enable native tests for macOS+`dotnet test`