chore: bump squidfunk/mkdocs-material in /docs (#2074)

Bumps squidfunk/mkdocs-material from `405aeb6` to `1a4e939`.

---
updated-dependencies:
- dependency-name: squidfunk/mkdocs-material
  dependency-version: 1a4e939cfd62b90943b6a829eb8544933e4e94eab18b8ca1d0f912fa9a532c37
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
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@sha256:405aeb6dbf1fcddd1082993eacf288a46648ea56b846323f001aee619015a23b
+FROM squidfunk/mkdocs-material@sha256:1a4e939cfd62b90943b6a829eb8544933e4e94eab18b8ca1d0f912fa9a532c37
 
 COPY requirements.txt /tmp/
 RUN pip install --require-hashes -r /tmp/requirements.txt