[Snyk] Security upgrade debian from 9.5-slim to 9.13-slim#284

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snyk-bot wants to merge 1 commit intomainfrom snyk-fix-10ba0fba46d70cca368517c9edd7c39c

Commits on Jul 31, 2021

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