[Snyk] Security upgrade debian from stretch-20210408-slim to 9-slim#308

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dotam99 wants to merge 1 commit intomainfrom

snyk-fix-67ed500832c6534614fca41d4b352821

Commits on May 29, 2022

fix: content/actions/creating-actions/dockerfile-support-for-github-actions.md to reduce vulnerabilities
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