update schema version regex for 1.2.x

Author: thekaveman

schema/templates/common.json

@@ -706,7 +706,7 @@
       "examples": [
         "1.0.0"
       ],
-      "pattern": "^1\\.0\\.[0-9]+$"
+      "pattern": "^1\\.2\\.[0-9]+$"
     }
   }
 }