chore(deps): bump mkdocs-material from 9.5.14 to 9.5.15 in /docs (#2274)

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.5.14 to 9.5.15.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.5.14...9.5.15)

---
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==9.5.14
+mkdocs-material==9.5.15
 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==9.5.14 \
-    --hash=sha256:2a1f8e67cda2587ab93ecea9ba42d0ca61d1d7b5fad8cf690eeaeb39dcd4b9af \
-    --hash=sha256:a45244ac221fda46ecf8337f00ec0e5cb5348ab9ffb203ca2a0c313b0d4dbc27
+mkdocs-material==9.5.15 \
+    --hash=sha256:39f03cca45e82bf54eb7456b5a18bd252eabfdd67f237a229471484a0a4d4635 \
+    --hash=sha256:e5c96dec3d19491de49ca643fc1dbb92b278e43cdb816c775bc47db77d9b62fb
     # via -r requirements.in
 mkdocs-material-extensions==1.3.1 \
     --hash=sha256:10c9511cea88f568257f960358a467d12b970e1f7b2c0e5fb2bb48cab1928443 \