CI: Ignore contributor covenant links

Author: klieret

.github/mlc_config.json

@@ -23,6 +23,9 @@
     },
     {
       "pattern": "https?://(.*\\.)?x\\.com/.*"
+    },
+    {
+      "pattern": "https://www\\.contributor-covenant\\.org/version/2/1/code_of_conduct\\.html"
     }
   ]
 }