www/rubygem-rack22: Update to 2.2.23

Changes: https://github.com/rack/rack/blob/2-2-stable/CHANGELOG.md
Security: CVE-2026-26961, CVE-2026-34230, CVE-2026-34763, CVE-2026-34785, CVE-2026-34786, CVE-2026-34826, CVE-2026-34829, CVE-2026-34830, CVE-2026-34831
(cherry picked from commit 2b16962d45156a4d4e41e1fe4c6d443354a43c4b)