Bump git/ext/gitdb from f8fdfec to 65321a2

Bumps [git/ext/gitdb](https://github.com/gitpython-developers/gitdb) from `f8fdfec` to `65321a2`.
- [Release notes](https://github.com/gitpython-developers/gitdb/releases)
- [Commits](gitpython-developers/gitdb@f8fdfec...65321a2)

---
updated-dependencies:
- dependency-name: git/ext/gitdb
  dependency-version: 65321a28b586df60b9d1508228e2f53a35f938eb
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]