Update dependencies and enhance UptimeStatusIsland component with timezone and locale handling

- Added luxon library for improved date handling.
- Updated UptimeStatusIsland component to format and display local time for heartbeats.
- Enhanced state management to track user timezone and locale.
- Ensured UTC formatting for timestamps in API responses.

package.json

@@ -39,6 +39,7 @@
     "form-data": "^4.0.2",
     "limax": "4.1.0",
     "lodash.merge": "^4.6.2",
+    "luxon": "^3.6.1",
     "node-fetch": "^3.3.2",
     "nodemailer": "^6.10.0",
     "rate-limiter-flexible": "^5.0.5",