www/sogo: Update to 5.12.7

5.12.7 is a major release as it fixes 2 major vulnerabilities, 5.12.6
addresses another vulnerability.

While at it:
o pet portlint,
o make the installed configuration file for sysutils/logrotate useable

out of the box by replacing sogo:sogo with sogod:sogod,

o make the installed sogo-backup.sh useable out of the box by:

• correcting the path to sogo-tool,
• changing the function definitions to match sh(1) syntax, saving a dependency on shells/bash, and
• installing it as executable.

Approved by: acm (maintainer)
Security: https://www.sogo.nu/news/2026/sogo-v5126-released.html
Security: https://www.sogo.nu/news/2026/sogo-v5127-released.html
Differential Revision: https://reviews.freebsd.org/D56426