security/openvpn: Update 2.7.4 => 2.7.5 (fix 6 CVEs)
Changelog:
https://github.com/OpenVPN/openvpn/blob/v2.7.5/Changes.rst
The upstream's signing sub-key expired yesterday, new key provided via
https://swupdate.openvpn.net/community/keys/gpgkey-F554A3687412CFFEBDEFE0A312F5F7B42F2B01E7.gpg
PR: 296429
Security: ffa897a0-756f-11f1-b291-a74de6bb0320
Security: CVE-2026-11771
Security: CVE-2026-12932
Security: CVE-2026-12996
Security: CVE-2026-13117
Security: CVE-2026-13122
Security: CVE-2026-13698
Sponsored by: UNIS Labs
MFH: 2026Q2
(cherry picked from commit 7bcce8a1bb5c23d738b378619625289403dffe37)