This allows Keycloak to send emails.
Using naked TLS fails with:
```
Mar 23 00:10:50 public01 keycloak-start[875412]: Caused by: jakarta.mail.MessagingException: Could not connect to SMTP host: smtp.postmarkapp.com, port: 2525;
Mar 23 00:10:50 public01 keycloak-start[875412]: nested exception is:
Mar 23 00:10:50 public01 keycloak-start[875412]: javax.net.ssl.SSLException: Unsupported or unrecognized SSL message
Mar 23 00:10:50 public01 keycloak-start[875412]: at org.eclipse.angus.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2245)
Mar 23 00:10:50 public01 keycloak-start[875412]: at org.eclipse.angus.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:729)
Mar 23 00:10:50 public01 keycloak-start[875412]: at jakarta.mail.Service.connect(Service.java:342)
Mar 23 00:10:50 public01 keycloak-start[875412]: at jakarta.mail.Service.connect(Service.java:222)
Mar 23 00:10:50 public01 keycloak-start[875412]: at jakarta.mail.Service.connect(Service.java:243)
Mar 23 00:10:50 public01 keycloak-start[875412]: at org.keycloak.email.DefaultEmailSenderProvider.send(DefaultEmailSenderProvider.java:161)
Mar 23 00:10:50 public01 keycloak-start[875412]: ... 17 more
Mar 23 00:10:50 public01 keycloak-start[875412]: Caused by: javax.net.ssl.SSLException: Unsupported or unrecognized SSL message
```
With starttls, we can send emails, so use that.
Change-Id: I5898bec4f9413a8714c9adb1654d9e964022d183
Reviewed-on: https://cl.snix.dev/c/snix/+/30249
Tested-by: besadii
Reviewed-by: Ilan Joselevich <personal@ilanjoselevich.com>
Autosubmit: Florian Klink <flokli@flokli.de>
5f0697083f