Bump actionmailer from 3.2.12 to 6.0.2.1
Bump actionmailer from 3.2.12 to 6.0.2.1

Bumps [actionmailer](https://github.com/rails/rails) from 3.2.12 to 6.0.2.1.
- [Release notes](https://github.com/rails/rails/releases)
- [Changelog](https://github.com/rails/rails/blob/v6.0.2.1/actionmailer/CHANGELOG.md)
- [Commits](https://github.com/rails/rails/compare/v3.2.12...v6.0.2.1)

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