Update alpine Docker tag to v3.21.2

renovate[bot] · web-flow · commit fd9d39f8722f · 2025-01-08T22:27:29.000Z
diff --git a/Dockerfile b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.11.6
+FROM alpine:3.21.2
 
 LABEL version="1.0.1"
 LABEL maintainer="nownabe"
