security/modsecurity3: Update 3.0.15 => 3.0.16

Changelog:
https://github.com/owasp-modsecurity/ModSecurity/blob/v3.0.16/CHANGES

PR: 296385
Approved by: osa, vvd (Mentors, implicit)
MFH: 2026Q2
Security: CVE-2026-52761 (Details not yet available)
Security: CVE-2026-52747 (Details not yet available)

(cherry picked from commit 9cfd1534f9e4223618cda66aca81768bbc6a3d3b)