deps(example): bump the dependencies group

Bumps the dependencies group in /examples/nextjs-authjs-5 with 2 updates: [@types/react](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react) and [postcss](https://github.com/postcss/postcss).


Updates `@types/react` from 19.0.6 to 19.0.7
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/react)

Updates `postcss` from 8.5.0 to 8.5.1
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.0...8.5.1)

---
updated-dependencies:
- dependency-name: "@types/react"
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dependencies
- dependency-name: postcss
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>

examples/nextjs-authjs-5/package.json

@@ -26,10 +26,10 @@
   },
   "devDependencies": {
     "@types/node": "^18",
-    "@types/react": "^19.0.6",
+    "@types/react": "^19.0.7",
     "@types/react-dom": "^19.0.3",
     "autoprefixer": "^10.4.20",
-    "postcss": "^8.5.0",
+    "postcss": "^8.5.1",
     "tailwindcss": "^3.4.17",
     "typescript": "^5.2.2"
   }