Bump git/ext/gitdb from 335c0f6 to 53c94d6

Bumps [git/ext/gitdb](https://github.com/gitpython-developers/gitdb) from `335c0f6` to `53c94d6`.
- [Release notes](https://github.com/gitpython-developers/gitdb/releases)
- [Commits](gitpython-developers/gitdb@335c0f6...53c94d6)

---
updated-dependencies:
- dependency-name: git/ext/gitdb
  dependency-version: 53c94d682b541595918cea6fc2e96bb900eb0e8c
  dependency-type: direct:production
...

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Author: dependabot[bot]