[Snyk] Security upgrade alpine from 3.18.3 to 3.21.3#91

pozgo wants to merge 1 commit intomasterpozgo/docker-mkdocs:masterfrom

snyk-fix-69fd75e6e7dc1d4fb19d73b4c1a8e803pozgo/docker-mkdocs:snyk-fix-69fd75e6e7dc1d4fb19d73b4c1a8e803Copy head branch name to clipboard