Suppress error message from app updater when offline

Looks like error message from Tauri has changed.

Author: mtsgrd

apps/desktop/src/lib/updater/updater.ts

@@ -168,7 +168,7 @@ export class UpdaterService {
 function isOffline(err: any): boolean {
 	return (
 		typeof err === 'string' &&
-		(err.includes('Could not fetch a valid release') || err.includes('Network Error'))
+		(err.includes('error sending request for') || err.includes('Network Error'))
 	);
 }