Update app.py

app.py

@@ -174,7 +174,7 @@ async def _startup():
 
 @app.get("/health")
 async def health():
-    return {"status": "healthy", "timestamp": dt.utcnow().isoformat()}
+    return {"status": "healthy", "timestamp": dt.now().isoformat()}
 
 @app.post("/api/browser/launch")
 async def launch(request: BrowserLaunchRequest):