Bump gidgethub from 5.2.0 to 5.2.1 (#587)

Bumps [gidgethub](https://github.com/brettcannon/gidgethub) from 5.2.0 to 5.2.1.
- [Release notes](https://github.com/brettcannon/gidgethub/releases)
- [Changelog](https://github.com/brettcannon/gidgethub/blob/main/docs/changelog.rst)
- [Commits](gidgethub/gidgethub@v5.2.0...v5.2.1)

---
updated-dependencies:
- dependency-name: gidgethub
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 # cherry_picker==2.0.0
 git+https://github.com/python/cherry-picker.git@main#egg=cherry_picker
 aiohttp==3.8.3
-gidgethub==5.2.0
+gidgethub==5.2.1
 cachetools==5.2.0
 redis==4.3.4
 celery==5.2.7