chore(deps): bump squidfunk/mkdocs-material from 3678304 to 6c81a89 in /docs (#3973)

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

Bumps squidfunk/mkdocs-material from `3678304` to `6c81a89`.

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

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

Author: dependabot[bot]

docs/Dockerfile

@@ -1,5 +1,5 @@
 # v9.1.18
-FROM squidfunk/mkdocs-material@sha256:3678304a65e17660953a30c0a0be0bc2fb8f55ac450216c14af6ba942badc4dc
+FROM squidfunk/mkdocs-material@sha256:6c81a890d0b5a59cc36e53684ae696995aa1f526f1406106f9bfec49d5031581
 # pip-compile --generate-hashes --output-file=requirements.txt requirements.in
 COPY requirements.txt /tmp/
 RUN pip install --require-hashes -r /tmp/requirements.txt