Bump squidfunk/mkdocs-material from 9.0.1 to 9.0.6 (#220)

Bumps squidfunk/mkdocs-material from 9.0.1 to 9.0.6.

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

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Dockerfile

@@ -1,4 +1,4 @@
-FROM squidfunk/mkdocs-material:9.0.1
+FROM squidfunk/mkdocs-material:9.0.6
 LABEL maintainer="Michael Hausenblas, hausenbl@amazon.com"
 
 COPY action.sh /action.sh