Update CredScanSuppressions.json (Azure#26389)

Author: VeryEarly

tools/SecurityTools/CredScanSuppressions.json

@@ -1348,6 +1348,10 @@
     {
       "file": "src\\Resources\\MSGraph.Autorest\\exports\\ProxyCmdletDefinitions.ps1",
       "_justification": "False positive, there are no cred in this file."
+    },
+    {
+      "file": "src\\Resources\\MSGraph.Autorest\\exports\\New-AzADUser.ps1",
+      "_justification": "False positive, there are no cred in this file."
     }
   ]
 }