Add alpine 3.20

https://alpinelinux.org/posts/Alpine-3.20.0-released.html

Author: Earlopain

3.1/alpine3.18/Dockerfile renamed to 3.1/alpine3.20/Dockerfile

@@ -33,8 +33,8 @@
       "slim-bookworm",
       "bullseye",
       "slim-bullseye",
-      "alpine3.19",
-      "alpine3.18"
+      "alpine3.20",
+      "alpine3.19"
     ]
   },
   "3.2": {
@@ -71,8 +71,8 @@
       "slim-bookworm",
       "bullseye",
       "slim-bullseye",
-      "alpine3.19",
-      "alpine3.18"
+      "alpine3.20",
+      "alpine3.19"
     ],
     "rust": {
       "version": "1.74.1"
@@ -142,8 +142,8 @@
       "slim-bookworm",
       "bullseye",
       "slim-bullseye",
-      "alpine3.19",
-      "alpine3.18"
+      "alpine3.20",
+      "alpine3.19"
     ],
     "rust": {
       "version": "1.74.1"
@@ -219,8 +219,8 @@
       "slim-bookworm",
       "bullseye",
       "slim-bullseye",
-      "alpine3.19",
-      "alpine3.18"
+      "alpine3.20",
+      "alpine3.19"
     ],
     "rust": {
       "version": "1.74.1"

3.2/alpine3.18/Dockerfile renamed to 3.2/alpine3.20/Dockerfile

@@ -88,8 +88,8 @@ for version in "${versions[@]}"; do
 				empty # trailing comma hack
 			| ., "slim-" + .), # https://github.com/docker-library/ruby/pull/142#issuecomment-320012893
 			(
+				"3.20",
 				"3.19",
-				"3.18",
 				empty # trailing comma hack
 			| "alpine" + .)
 		]