Shrink the maintained fork and bump BouncyCastle for downstream - #14

No file matched to [/home/runner/work/jgit/jgit/**/*requirements*.txt,/home/runner/work/jgit/jgit/**/*requirements*.in,/home/runner/work/jgit/jgit/**/*constraints*.txt,/home/runner/work/jgit/jgit/**/*constraints*.in,/home/runner/work/jgit/jgit/**/pyproject.toml,/home/runner/work/jgit/jgit/**/uv.lock,/home/runner/work/jgit/jgit/**/*.py.lock]. The cache will never get invalidated. Make sure you have checked out the target repository and configured the cache-dependency-glob input correctly.