chore(deps): update mkdocs-include-markdown-plugin requirement from >=6.0.0 to >=7.3.0 (#652)

Updates the requirements on [mkdocs-include-markdown-plugin](https://github.com/mondeja/mkdocs-include-markdown-plugin) to permit the latest version.
- [Release notes](https://github.com/mondeja/mkdocs-include-markdown-plugin/releases)
- [Commits](mondeja/mkdocs-include-markdown-plugin@v6.0.0...v7.3.0)

---
updated-dependencies:
- dependency-name: mkdocs-include-markdown-plugin
  dependency-version: 7.3.0
  dependency-type: direct:production
...

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requirements-docs.txt

@@ -1,5 +1,5 @@
 mdx_truly_sane_lists>=1.3
-mkdocs-include-markdown-plugin>=6.0.0
+mkdocs-include-markdown-plugin>=7.3.0
 mkdocs-material>=9.5.0
 mkdocstrings[python]>=0.24.0
 mkdocs>=1.5.0