chore: disable major Go dependency updates in Renovate

Major Go module version bumps require import path changes throughout the
source code, which Renovate cannot do automatically. Disable these PRs
to avoid noise from incomplete updates.

Author: carole-lavillonniere

renovate.json

@@ -26,7 +26,7 @@
       "matchManagers": ["gomod"],
       "excludePackageNames": ["go"],
       "matchUpdateTypes": ["major"],
-      "groupName": "Go dependencies (major)"
+      "enabled": false
     }
   ]
 }