build(deps): bump mkdocs-include-markdown-plugin from 6.0.3 to 6.0.4

Bumps [mkdocs-include-markdown-plugin](https://github.com/mondeja/mkdocs-include-markdown-plugin) from 6.0.3 to 6.0.4.
- [Release notes](https://github.com/mondeja/mkdocs-include-markdown-plugin/releases)
- [Commits](mondeja/mkdocs-include-markdown-plugin@v6.0.3...v6.0.4)

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

Signed-off-by: dependabot[bot] <[email protected]>

docs/requirements.txt

@@ -5,5 +5,5 @@ mkdocs-macros-plugin==1.0.5
 mkdocs-material==9.4.8
 mkdocs-minify-plugin==0.7.1
 mkdocs-redirects==1.2.1
-mkdocs-include-markdown-plugin==6.0.3
+mkdocs-include-markdown-plugin==6.0.4
 mkdocs-markdownextradata-plugin==0.2.5