Bump the mkdocs group with 2 updates (#811)

Bumps the mkdocs group with 2 updates: [mkdocs-bibtex](https://github.com/shyamd/mkdocs-bibtex) and [mkdocs-material](https://github.com/squidfunk/mkdocs-material).


Updates `mkdocs-bibtex` from 4.3.0 to 4.4.0
- [Release notes](https://github.com/shyamd/mkdocs-bibtex/releases)
- [Commits](shyamd/mkdocs-bibtex@v4.3.0...v4.4.0)

Updates `mkdocs-material` from 9.6.14 to 9.6.15
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.6.14...9.6.15)

---
updated-dependencies:
- dependency-name: mkdocs-bibtex
  dependency-version: 4.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: mkdocs
- dependency-name: mkdocs-material
  dependency-version: 9.6.15
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: mkdocs
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,8 +1,8 @@
 mkdocs==1.6.1
-mkdocs-bibtex==4.3.0
+mkdocs-bibtex==4.4.0
 mkdocs-include-markdown-plugin==7.1.6
 mkdocs-table-reader-plugin==3.1.0
-mkdocs-material==9.6.14
+mkdocs-material==9.6.15
 mkdocs-material-extensions==1.3.1
 mkdocstrings==0.29.1
 mkdocstrings-python==1.16.12