build(deps-dev): bump mkdocs-macros-plugin from 1.3.7 to 1.3.9

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:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]