Bump mkdocs-include-markdown-plugin from 7.0.0 to 7.1.8 in /requirements

Bumps [mkdocs-include-markdown-plugin](https://github.com/mondeja/mkdocs-include-markdown-plugin) from 7.0.0 to 7.1.8.
- [Release notes](https://github.com/mondeja/mkdocs-include-markdown-plugin/releases)
- [Commits](mondeja/mkdocs-include-markdown-plugin@v7.0.0...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]

requirements/docs.txt

@@ -1,3 +1,3 @@
 mkdocs==1.6.1
-mkdocs-include-markdown-plugin==7.0.0
+mkdocs-include-markdown-plugin==7.1.8
 mkdocs-material==9.5.34