mail/roundcube-sieverules: Update to 2.3

Maintainer timeout expired: anes@anes.su

Additional port changes:

• Changed to DISTVERSION
• Adjusted case of GH_ACCOUNT/GH_PROJECT
• Silenced the command

PR: 224289
Submitted by: Krzysztof <ports@bsdserwis.com>
Approved by: tcberner (mentor, implicit)