[Snyk] Security upgrade debian from stretch-20210329-slim to stretch-20210721-slim#120

Open

snyk-bot wants to merge 1 commit intomainfrom

snyk-fix-2c38da34f9c105ac1fd6fbb62b34c108

Commits on Jul 22, 2021

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