Update ibm_catalog.json

Author: maheshwarishikha

ibm_catalog.json

@@ -275,6 +275,10 @@
               "key": "prefix",
               "required": true
             },
+            {
+              "key": "ibmcloud_api_key",
+              "required": true
+            },
             {
               "key": "signing_key",
               "display_name": "Multiline secure value",