chore: bump squidfunk/mkdocs-material in /docs (#2058)

Bumps squidfunk/mkdocs-material from `bb7b015` to `405aeb6`.

---
updated-dependencies:
- dependency-name: squidfunk/mkdocs-material
  dependency-version: 405aeb6dbf1fcddd1082993eacf288a46648ea56b846323f001aee619015a23b
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docs/Dockerfile

@@ -1,4 +1,4 @@
-FROM squidfunk/mkdocs-material@sha256:bb7b015690d9fb5ef0dbc98ca3520f153aa43129fb96aec5ca54c9154dc3b729
+FROM squidfunk/mkdocs-material@sha256:405aeb6dbf1fcddd1082993eacf288a46648ea56b846323f001aee619015a23b
 
 COPY requirements.txt /tmp/
 RUN pip install --require-hashes -r /tmp/requirements.txt