databases/mariadb106-{client,server}: Update 10.6.21 => 10.6.22

Release notes:
https://mariadb.com/kb/en/mariadb-10-6-22-release-notes/

While here remove stale variable ZSTD_LIB_DEPENDS and unbreak
COLUMNSTORE option.

PR: 285895
Approved by: brnrd (maintainer, timeout > 3 weeks)
Security: CVE-2025-30722
Security: CVE-2025-30693
Security: CVE-2023-52970
Security: CVE-2023-52969
MFH: 2025Q2

(cherry picked from commit baa5b9235fe978286ba36156605c4be0fabcea33)