npm-azure-ad-b2c-frontend: bump prettier

Bumps [prettier](https://github.com/prettier/prettier) from 3.7.4 to 3.8.1.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](prettier/prettier@3.7.4...3.8.1)

---
updated-dependencies:
- dependency-name: prettier
  dependency-version: 3.8.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

samples/AzureADB2CAuth/auth-frontend/app/package.json

@@ -51,7 +51,7 @@
     "jiti": "2.6.1",
     "jsdom": "27.3.0",
     "npm-run-all2": "8.0.4",
-    "prettier": "3.7.4",
+    "prettier": "3.8.1",
     "typescript": "5.8.3",
     "vite": "7.3.1",
     "vite-plugin-vue-devtools": "8.0.7",