Bump next and @react-email/ui

Bumps [next](https://github.com/vercel/next.js) to 16.4.1 and updates ancestor dependency [@react-email/ui](https://github.com/resend/react-email/tree/HEAD/packages/ui). These dependencies need to be updated together.


Updates `next` from 16.3.3 to 16.4.1
- [Release notes](https://github.com/vercel/next.js/releases)
- [Commits](https://github.com/vercel/next.js/compare/v16.3.3...v16.4.1)

Updates `@react-email/ui` from 6.11.2 to 6.11.3
- [Release notes](https://github.com/resend/react-email/releases)
- [Changelog](https://github.com/resend/react-email/blob/canary/packages/ui/CHANGELOG.md)
- [Commits](https://github.com/resend/react-email/commits/@react-email/ui@6.11.3/packages/ui)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.4.1
  dependency-type: indirect
- dependency-name: "@react-email/ui"
  dependency-version: 6.11.3
  dependency-type: direct:development
...

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

package.json

@@ -141,7 +141,7 @@
     "devDependencies": {
         "@dotenvx/dotenvx": "2.37.0",
         "@esbuild-plugins/tsconfig-paths": "0.1.2",
-        "@react-email/ui": "^6.11.2",
+        "@react-email/ui": "^6.11.3",
         "@tailwindcss/postcss": "4.3.3",
         "@tanstack/react-query-devtools": "5.104.3",
         "@types/better-sqlite3": "7.6.13",