Bump mkdocs-material-extensions from 1.3 to 1.3.1 (#435)

Bumps [mkdocs-material-extensions](https://github.com/facelessuser/mkdocs-material-extensions) from 1.3 to 1.3.1.
- [Release notes](https://github.com/facelessuser/mkdocs-material-extensions/releases)
- [Changelog](https://github.com/facelessuser/mkdocs-material-extensions/blob/master/changelog.md)
- [Commits](facelessuser/mkdocs-material-extensions@1.3...1.3.1)

---
updated-dependencies:
- dependency-name: mkdocs-material-extensions
  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>

requirements.txt

@@ -3,7 +3,7 @@ mkdocs-bibtex==2.12.0
 mkdocs-include-markdown-plugin==6.0.4
 mkdocs-table-reader-plugin==2.1.0
 mkdocs-material==9.5.7
-mkdocs-material-extensions==1.3
+mkdocs-material-extensions==1.3.1
 mkdocstrings==0.24.0
 mkdocstrings-python==1.8.0
 mkdocs-print-site-plugin==2.3.6