[Snyk] Security upgrade debian from 9.5-slim to stretch-20210621-slim#55

Open

snyk-bot wants to merge 1 commit intomainfrom snyk-fix-716dd8b1ab14886aaafb300c0fbab8a0

+1-1

Commits on Jun 30, 2021

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