databases/redis62: Update version 6.2.19=>6.2.20

Changelog: https://github.com/redis/redis/releases/tag/6.2.20

MFH: 2025Q4
Security: CVE-2025-49844
Security: CVE-2025-46817
Security: CVE-2025-46818
Security: CVE-2025-46819
(cherry picked from commit 2734a31d582804d51711bff17829e3c498235b0b)