Update 3.9 to 3.9.15

Author: docker-library-bot

3.9/alpine3.15/Dockerfile

@@ -96,6 +96,6 @@
       "alpine3.16",
       "alpine3.15"
     ],
-    "version": "3.9.14"
+    "version": "3.9.15"
   }
 }