Fix validation error

Author: Zijian-Ju

specification/app/resource-manager/Microsoft.App/preview/2023-04-01-preview/ContainerApps.json

@@ -506,7 +506,8 @@
             "in": "path",
             "description": "Name of the Container App.",
             "required": true,
-            "type": "string"
+            "type": "string",
+            "pattern": "^[-\\w\\._\\(\\)]+$"
           }
         ],
         "responses": {
@@ -561,7 +562,8 @@
             "in": "path",
             "description": "Name of the Container App.",
             "required": true,
-            "type": "string"
+            "type": "string",
+            "pattern": "^[-\\w\\._\\(\\)]+$"
           }
         ],
         "responses": {