Update @sendgrid/mail requirement from ^6.5.1 to ^6.5.2 (#123)
Update @sendgrid/mail requirement from ^6.5.1 to ^6.5.2 (#123)

Updates the requirements on [@sendgrid/mail](https://github.com/sendgrid/sendgrid-nodejs) to permit the latest version.
- [Release notes](https://github.com/sendgrid/sendgrid-nodejs/releases)
- [Changelog](https://github.com/sendgrid/sendgrid-nodejs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sendgrid/sendgrid-nodejs/compare/6.5.1...6.5.2)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
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