Add Alpine 3.21 (drop 3.19)

1.11/alpine3.21/Dockerfile

@@ -4,7 +4,7 @@
 # PLEASE DO NOT EDIT IT DIRECTLY.
 #
 
-FROM alpine:3.19
+FROM alpine:3.21
 
 ENV JULIA_PATH /usr/local/julia
 ENV PATH $JULIA_PATH/bin:$PATH

versions.json

@@ -92,8 +92,8 @@
     "variants": [
       "bookworm",
       "bullseye",
+      "alpine3.21",
       "alpine3.20",
-      "alpine3.19",
       "windows/windowsservercore-ltsc2022",
       "windows/windowsservercore-1809"
     ],

versions.sh

@@ -104,8 +104,8 @@ for version in "${versions[@]}"; do
 			"bookworm",
 			"bullseye",
 			if .arches | keys | any(startswith("alpine-")) then
+				"3.21",
 				"3.20",
-				"3.19",
 				empty
 				| "alpine" + .
 			else empty end,