Bump squidfunk/mkdocs-material from 9.0.6 to 9.1.3

Bumps squidfunk/mkdocs-material from 9.0.6 to 9.1.3.

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

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

Dockerfile

@@ -1,4 +1,4 @@
-FROM squidfunk/mkdocs-material:9.0.6
+FROM squidfunk/mkdocs-material:9.1.3
 LABEL maintainer="Michael Hausenblas, hausenbl@amazon.com"
 
 COPY action.sh /action.sh