Update alpine Docker tag to v3.21.3 (#131)

renovate[bot] · web-flow · commit 85a6e1a1abd5 · 2025-02-18T11:33:10.000+01:00
Co-authored-by: renovate[bot] &lt;29139614+renovate[bot]@users.noreply.github.com&gt;
diff --git a/Dockerfile b/Dockerfile
@@ -1,5 +1,5 @@
 FROM cloudflare/cloudflared:2025.2.0 as cloudflared
-FROM alpine:3.21.2
+FROM alpine:3.21.3
 
 RUN apk add jq~=1.7 --no-cache
 
