chore(deps): bump pg and @types/pg

Bumps [pg](https://github.com/brianc/node-postgres/tree/HEAD/packages/pg) and [@types/pg](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/pg). These dependencies needed to be updated together.

Updates `pg` from 8.17.2 to 8.19.0
- [Changelog](https://github.com/brianc/node-postgres/blob/master/CHANGELOG.md)
- [Commits](https://github.com/brianc/node-postgres/commits/pg@8.19.0/packages/pg)

Updates `@types/pg` from 8.16.0 to 8.18.0
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/pg)

---
updated-dependencies:
- dependency-name: pg
  dependency-version: 8.19.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: "@types/pg"
  dependency-version: 8.18.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

packages/auth/package.json

@@ -21,13 +21,13 @@
     "better-auth": "^1.4.18",
     "better-sqlite3": "^12.6.2",
     "mongodb": "^7.1.0",
-    "pg": "^8.11.3"
+    "pg": "^8.19.0"
   },
   "devDependencies": {
     "@types/better-sqlite3": "^7.6.0",
     "@types/jest": "^30.0.0",
     "@types/node": "^25.2.0",
-    "@types/pg": "^8.11.0",
+    "@types/pg": "^8.18.0",
     "jest": "^30.2.0",
     "ts-jest": "^29.4.6",
     "tsup": "^8.5.1",