x11-servers/xorg-server: Update to 21.1.17

Release notes: https://lists.x.org/archives/xorg-announce/2025-June/003609.html

Security: CVE-2025-49175 CVE-2025-49176 CVE-2025-49177 CVE-2025-49178 CVE-2025-49179 CVE-2025-49180
Sponsored by: Beckhoff Automation GmbH & Co. KG