[Snyk] Security upgrade alpine from 3.1 to 3.15#13

snyk-bot wants to merge 1 commit intomasterpozgo/docker-subgit:masterfrom

snyk-fix-a977abca0ce14b8d5ed1ffee29c6d66cpozgo/docker-subgit:snyk-fix-a977abca0ce14b8d5ed1ffee29c6d66cCopy head branch name to clipboard