⬆ Bump mkdocs-macros-plugin from 1.3.7 to 1.3.9 (#1507)

Bumps [mkdocs-macros-plugin](https://github.com/fralau/mkdocs_macros_plugin) from 1.3.7 to 1.3.9.
- [Release notes](https://github.com/fralau/mkdocs_macros_plugin/releases)
- [Changelog](https://github.com/fralau/mkdocs-macros-plugin/blob/master/CHANGELOG.md)
- [Commits](fralau/mkdocs-macros-plugin@v1.3.7...v1.3.9)

---
updated-dependencies:
- dependency-name: mkdocs-macros-plugin
  dependency-version: 1.3.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements-docs.txt

@@ -14,5 +14,5 @@ cairosvg==2.8.2
 griffe-typingdoc==0.2.8
 # For griffe, it formats with black
 typer == 0.16.0
-mkdocs-macros-plugin==1.3.7
+mkdocs-macros-plugin==1.3.9
 markdown-include-variants==0.0.4