Bump resend from 6.2.0 to 6.4.0

Bumps [resend](https://github.com/resend/resend-node) from 6.2.0 to 6.4.0.
- [Release notes](https://github.com/resend/resend-node/releases)
- [Commits](resend/resend-node@v6.2.0...v6.4.0)

---
updated-dependencies:
- dependency-name: resend
  dependency-version: 6.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]