[Snyk] Security upgrade debian from 9.5-slim to stretch-20210721-slim#100

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snyk-bot wants to merge 1 commit intomainfrom snyk-fix-3ea1633577513139c01d9e6ad4a0c6a8

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Commits on Jul 23, 2021

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