Bump pg from 8.20.0 to 8.22.0 in /frontend

Bumps [pg](https://github.com/brianc/node-postgres/tree/HEAD/packages/pg) from 8.20.0 to 8.22.0.
- [Changelog](https://github.com/brianc/node-postgres/blob/master/CHANGELOG.md)
- [Commits](https://github.com/brianc/node-postgres/commits/pg@8.22.0/packages/pg)

---
updated-dependencies:
- dependency-name: pg
  dependency-version: 8.22.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

frontend/package.json

@@ -18,7 +18,7 @@
     "better-auth": "^1.6.9",
     "kysely": "^0.28.16",
     "next": "16.2.9",
-    "pg": "^8.20.0",
+    "pg": "^8.22.0",
     "react": "19.2.7",
     "react-dom": "19.2.7",
     "react-easy-crop": "^5.5.7",