Chore(deps): Bump mkdocs-include-markdown-plugin in /docs

Bumps [mkdocs-include-markdown-plugin](https://github.com/mondeja/mkdocs-include-markdown-plugin) from 4.0.3 to 7.1.8.
- [Release notes](https://github.com/mondeja/mkdocs-include-markdown-plugin/releases)
- [Commits](mondeja/mkdocs-include-markdown-plugin@v4.0.3...v7.1.8)

---
updated-dependencies:
- dependency-name: mkdocs-include-markdown-plugin
  dependency-version: 7.1.8
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -1,5 +1,5 @@
 mkdocs==1.4.2
-mkdocs-include-markdown-plugin==4.0.3
+mkdocs-include-markdown-plugin==7.1.8
 mkdocs-material==9.0.5
 mkdocs-material-extensions==1.1.1
 pdoc==14.5.1