irc/scrollz: Update to version 2.3.1

ChangeLog: https://www.scrollz.info/download/ChangeLog.2.3.1.txt

Use online commit to avoid gcc.

PR: 262693
Reported by: Christopher.petrik@usm.edu
Approved by: freebsd@bitchx.org (maintainer, timeout > 2 weeks)
Reviewed by: mikael@
MFH: 2022Q2 (bugfix release, security)
Security: CVE-2021-29376

(cherry picked from commit c4a37205059c6f8e365b50ee29e82e15a3e41221)