chore(deps): bump mkdocs-material from 9.5.8 to 9.5.9 in /docs (#2051)

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.5.8 to 9.5.9.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.5.8...9.5.9)

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

Author: dependabot[bot]

docs/requirements.in

@@ -1,4 +1,4 @@
 mike==1.1.2
-mkdocs-material==9.5.8
+mkdocs-material==9.5.9
 mkdocs-git-revision-date-plugin==0.3.2
 mkdocs-exclude==1.0.2

docs/requirements.txt

@@ -229,9 +229,9 @@ mkdocs-exclude==1.0.2 \
 mkdocs-git-revision-date-plugin==0.3.2 \
     --hash=sha256:2e67956cb01823dd2418e2833f3623dee8604cdf223bddd005fe36226a56f6ef
     # via -r requirements.in
-mkdocs-material==9.5.8 \
-    --hash=sha256:14563314bbf97da4bfafc69053772341babfaeb3329cde01d3e63cec03997af8 \
-    --hash=sha256:2a429213e83f84eda7a588e2b186316d806aac602b7f93990042f7a1f3d3cf65
+mkdocs-material==9.5.9 \
+    --hash=sha256:635df543c01c25c412d6c22991872267723737d5a2f062490f33b2da1c013c6d \
+    --hash=sha256:a5d62b73b3b74349e45472bfadc129c871dd2d4add68d84819580597b2f50d5d
     # via -r requirements.in
 mkdocs-material-extensions==1.3.1 \
     --hash=sha256:10c9511cea88f568257f960358a467d12b970e1f7b2c0e5fb2bb48cab1928443 \