Bump to xamarin/Java.Interop/main@fcc33ce2 (#7380)

Fixes: dotnet/java-interop#1031

Changes: dotnet/java-interop@2c8b0a8...fcc33ce

  * dotnet/java-interop@fcc33ce2: [java-source-utils] Add `$schema` to `CGManifest.json` (#1035)
  * dotnet/java-interop@58de60f2: [generator] Handle Java class with base class set to itself. (#1032)