Always write upstream to local if there are differences

package_alerts/package_alerts

@@ -285,6 +285,7 @@ if __name__ == "__main__":
                 print(f"{len(differences)} new package(s) detected", flush=True)
                 for p in differences:
                     format_release(p, feed, token)
+                set_local(upstream_packages, feed)
         if upstream_packages > local_packages:
             set_local(upstream_packages, feed)
     logfile.close()