build(deps-dev): update mkdocs-material requirement from <9.5.0,>=9.1.0 to >=9.1.0,<9.6.0 (#362)

Updates the requirements on [mkdocs-material](https://github.com/squidfunk/mkdocs-material) to permit the latest version.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.1.0...9.5.3)

---
updated-dependencies:
- dependency-name: mkdocs-material
  dependency-type: direct:development
...

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

Author: dependabot[bot]

requirements/dev.txt

@@ -1,7 +1,7 @@
 wget
 bump2version ==1.0.1
 # coverage >=4.5.4
-mkdocs-material >=9.1.0, <9.5.0
+mkdocs-material >=9.1.0, <9.6.0
 mkdocstrings[python] >=0.22.0, <0.23.0
 mknotebooks >=0.8.0, <0.9.0
 pytest >=5.3.2