Update 3.9 to 3.9.20

Author: docker-library-bot

3.9/alpine3.19/Dockerfile

@@ -127,6 +127,6 @@
       "alpine3.20",
       "alpine3.19"
     ],
-    "version": "3.9.19"
+    "version": "3.9.20"
   }
 }