[Snyk] Security upgrade debian from 9.5-slim to stretch-20210721-slim#103

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snyk-fix-2e2f3d111fcfda70363c1e45d1e28865

Commits on Jul 23, 2021

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