[Snyk] Security upgrade debian from 9.5-slim to stretch-20220509-slim#70

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tayminni80 wants to merge 1 commit intomainfrom snyk-fix-7f83a7363447b585da00d176c9e0a9ca

Commits on May 13, 2022

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