www/rubygem-rack: Update to 3.2.6

Changes: https://github.com/rack/rack/releases

		https://github.com/rack/rack/blob/3-2-stable/CHANGELOG.md

Security: CVE-2026-26961, CVE-2026-26962, CVE-2026-32762, CVE-2026-34230, CVE-2026-34763, CVE-2026-34785, CVE-2026-34786, CVE-2026-34826, CVE-2026-34827, CVE-2026-34829, CVE-2026-34830, CVE-2026-34831, CVE-2026-34835