chore(deps): bump github.com/emersion/go-smtp from 0.20.2 to 0.21.0 (#1888)

* chore(deps): bump github.com/emersion/go-smtp from 0.20.2 to 0.21.0

Bumps [github.com/emersion/go-smtp](https://github.com/emersion/go-smtp) from 0.20.2 to 0.21.0.
- [Release notes](https://github.com/emersion/go-smtp/releases)
- [Commits](https://github.com/emersion/go-smtp/compare/v0.20.2...v0.21.0)

---
updated-dependencies:
- dependency-name: github.com/emersion/go-smtp
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

* fix(reporter/email): use DialStartTLS instead of StartTLS

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: MaineK00n <mainek00n.1229@gmail.com>

subcmds/discover.go

@@ -127,6 +127,7 @@ func printConfigToml(ips []string) (err error) {
 #[email]
 #smtpAddr              = "smtp.example.com"
 #smtpPort              = "587"
+#tlsMode               = "STARTTLS"
 #tlsInsecureSkipVerify = false
 #user                  = "username"
 #password              = "password"