[Snyk] Security upgrade alpine from 3.18.3 to 3.21.2#87

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

snyk-fix-0e71adc29a1df3b24750d790da3f8464pozgo/docker-mkdocs:snyk-fix-0e71adc29a1df3b24750d790da3f8464Copy head branch name to clipboard