Update sphinx-github-changelog requirement from ~=1.2.0 to ~=1.2.1 (#514

)

Updates the requirements on [sphinx-github-changelog](https://github.com/ewjoachim/sphinx-github-changelog) to permit the latest version.
- [Release notes](https://github.com/ewjoachim/sphinx-github-changelog/releases)
- [Changelog](https://github.com/ewjoachim/sphinx-github-changelog/blob/main/CHANGELOG.rst)
- [Commits](ewjoachim/sphinx-github-changelog@1.2.0...1.2.1)

---
updated-dependencies:
- dependency-name: sphinx-github-changelog
  dependency-type: direct:production
...

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

docs/requirements.txt

@@ -1,6 +1,6 @@
 Sphinx~=6.1.3
 readthedocs-sphinx-ext~=2.2.0
 sphinx-rtd-theme~=1.2.0
-sphinx_github_changelog~=1.2.0
+sphinx_github_changelog~=1.2.1
 m2r2~=0.3.3
 sphinx-autodoc-typehints==1.23.4