build(deps): bump resend from 4.8.0 to 6.3.0 in /frontend

Bumps [resend](https://github.com/resendlabs/resend-node) from 4.8.0 to 6.3.0.
- [Release notes](https://github.com/resendlabs/resend-node/releases)
- [Commits](https://github.com/resendlabs/resend-node/commits)

---
updated-dependencies:
- dependency-name: resend
  dependency-version: 6.3.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

frontend/package.json

@@ -120,7 +120,7 @@
     "react-syntax-highlighter": "^15.6.4",
     "react-textarea-autosize": "^8.5.9",
     "recharts": "^2.15.4",
-    "resend": "^4.8.0",
+    "resend": "^6.4.2",
     "rrweb": "2.0.0-alpha.18",
     "rrweb-player": "2.0.0-alpha.18",
     "sharp": "^0.33.5",