Fixed Dockerfile reference

Author: mmaehren

src/main/resources/images/openssl/build.json

@@ -351,7 +351,7 @@
 
           "openssl-3.x": {
             "name": "openssl",
-            "dockerfile": "Dockerfile-3x",
+            "dockerfile": "Dockerfile-3_x",
             "versions": [
                 "0.0",
                 "0.1",