build(deps): bump @strapi/plugin-i18n in /playground

Bumps [@strapi/plugin-i18n](https://github.com/strapi/strapi/tree/HEAD/packages/plugins/i18n) from 4.15.0 to 4.15.1.
- [Release notes](https://github.com/strapi/strapi/releases)
- [Commits](https://github.com/strapi/strapi/commits/v4.15.1/packages/plugins/i18n)

---
updated-dependencies:
- dependency-name: "@strapi/plugin-i18n"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

playground/package.json

@@ -18,7 +18,7 @@
     "test": "echo no unittests"
   },
   "dependencies": {
-    "@strapi/plugin-i18n": "4.15.0",
+    "@strapi/plugin-i18n": "4.15.1",
     "@strapi/plugin-users-permissions": "4.15.0",
     "@strapi/strapi": "4.15.0",
     "better-sqlite3": "8.2.0",