logs: debug rollback versions, not info

lib/workers/repository/process/lookup/rollback.js

@@ -29,9 +29,10 @@ function getRollbackUpdate(config, versions) {
     return null;
   }
   logger.info(
-    { packageFile, depName, currentValue, versions },
+    { packageFile, depName, currentValue },
     `Current version not found - rolling back`
   );
+  logger.debug({ depName, versions }, 'Versions found before rolling back');
   lessThanVersions.sort(sortVersions);
   const toVersion = lessThanVersions.pop();
   let fromVersion;