emulators/virtualbox-ose{,-nox11,-kmod}-71: Update 7.1.10 => 7.1.12 (fixed 7 CVEs)

Changelog:
https://www.virtualbox.org/wiki/Changelog-7.1

List of fixed CVEs:
https://www.oracle.com/security-alerts/cpujul2025.html#AppendixOVIR

Security: CVE-2025-53024
Security: CVE-2025-53025
Security: CVE-2025-53026
Security: CVE-2025-53027
Security: CVE-2025-53028
Security: CVE-2025-53029
Security: CVE-2025-53030
MFH: 2025Q3
(cherry picked from commit fa4ed84463de93922ab0764ae49289217c4ef023)