Bump squidfunk/mkdocs-material from 9.5.33 to 9.5.40

Bumps squidfunk/mkdocs-material from 9.5.33 to 9.5.40.

---
updated-dependencies:
- dependency-name: squidfunk/mkdocs-material
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Dockerfile.mkdocs

@@ -1,3 +1,3 @@
-FROM squidfunk/mkdocs-material:9.5.33
+FROM squidfunk/mkdocs-material:9.5.40
 COPY docs/requirements.txt .
 RUN pip install -r requirements.txt