Update mkdocs-git-committers-plugin-2 requirement

Updates the requirements on [mkdocs-git-committers-plugin-2](https://github.com/ojacques/mkdocs-git-committers-plugin-2) to permit the latest version.
- [Release notes](https://github.com/ojacques/mkdocs-git-committers-plugin-2/releases)
- [Commits](ojacques/mkdocs-git-committers-plugin-2@1.2.0...2.2.2)

---
updated-dependencies:
- dependency-name: mkdocs-git-committers-plugin-2
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements-insiders.txt

@@ -4,6 +4,6 @@
 git+https://${GH_TOKEN_MATERIAL_INSIDERS}@github.com/squidfunk/[email protected]#egg=mkdocs-material
 # git+https://${GH_TOKEN_MATERIAL_INSIDERS}@github.com/squidfunk/mkdocs-material-insiders.git
 
-mkdocs-git-committers-plugin-2>=1.2,<2
+mkdocs-git-committers-plugin-2>=1.2,<3
 
 -r requirements.txt