net/freerdp3: Update 3.20.0 => 3.20.2

Changelogs:
https://github.com/FreeRDP/FreeRDP/releases/tag/3.20.1
https://github.com/FreeRDP/FreeRDP/releases/tag/3.20.2

Security: CVE-2026-22851
Security: CVE-2026-22852
Security: CVE-2026-22853
Security: CVE-2026-22854
Security: CVE-2026-22855
Security: CVE-2026-22856
Security: CVE-2026-22857
Security: CVE-2026-22858
Security: CVE-2026-22859
MFH: 2026Q1
(cherry picked from commit 30070ab8ee7821e1a9cf99ba13511c4ec631319e)