[Snyk] Security upgrade debian from 9.5-slim to stretch-20210816-slim#114

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snyk-bot wants to merge 1 commit intomainfrom snyk-fix-04e4061b0e9ebf7fb5e099c7176dada3

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Commits on Aug 18, 2021

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