Bump m2r2 from 0.2.7 to 0.2.8 in /docs (#240)

Bumps [m2r2](https://github.com/crossnox/m2r2) from 0.2.7 to 0.2.8.
- [Release notes](https://github.com/crossnox/m2r2/releases)
- [Changelog](https://github.com/CrossNox/m2r2/blob/development/CHANGES.md)
- [Commits](CrossNox/m2r2@v0.2.7...v0.2.8)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

docs/requirements.txt

@@ -6,7 +6,7 @@ sphinx-autodoc-typehints==1.12.0
 sphinxcontrib-mermaid==0.7
 sphinx-typlog-theme==0.8.0
 recommonmark==0.7.1
-m2r2==0.2.7
+m2r2==0.2.8
 tomlkit==0.7.2
 
 # Dependencies of our project: