[Snyk] Security upgrade debian from 9.5-slim to stretch-20210816-slim#6

Merged

aroc2021 merged 1 commit intomainfrom snyk-fix-2468f2b28ca0b8044817a3e7b465bb27

Oct 20, 2021

+1-1

Commits on Aug 18, 2021

fix: translations/ru-RU/content/actions/creating-actions/dockerfile-support-for-github-actions.md to reduce vulnerabilities
snyk-bot
committed