Bump pygit2 from 1.12.1 to 1.12.2

Bumps [pygit2](https://github.com/libgit2/pygit2) from 1.12.1 to 1.12.2.
- [Changelog](https://github.com/libgit2/pygit2/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/libgit2/pygit2/compare/v1.12.1...v1.12.2)

---
updated-dependencies:
- dependency-name: pygit2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements.txt

@@ -4,7 +4,7 @@ html5lib==1.1
 Markdown==3.4.3
 mwparserfromhell==0.6.4
 pycparser==2.21
-pygit2==1.12.1
+pygit2==1.12.2
 python-dateutil==2.8.2
 python-frontmatter==1.0.0
 python-liquid==1.9.2