Bump external/Java.Interop from 06214ff to 6cfa78c (#8879)

Bumps [external/Java.Interop](https://github.com/xamarin/java.interop) from `06214ff` to `6cfa78c`.
- [Commits](dotnet/java-interop@06214ff...6cfa78c)

---
updated-dependencies:
- dependency-name: external/Java.Interop
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>