Bump mkdocs-include-markdown-plugin from 3.4.1 to 3.9.1

Bumps [mkdocs-include-markdown-plugin](https://github.com/mondeja/mkdocs-include-markdown-plugin) from 3.4.1 to 3.9.1.
- [Release notes](https://github.com/mondeja/mkdocs-include-markdown-plugin/releases)
- [Commits](mondeja/mkdocs-include-markdown-plugin@v3.4.1...v3.9.1)

---
updated-dependencies:
- dependency-name: mkdocs-include-markdown-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]