security/easy-rsa: update to v3.1.1

Changelog: https://github.com/OpenVPN/easy-rsa/releases/tag/v3.1.1
Detailed: https://github.com/OpenVPN/easy-rsa/compare/v3.1.0...v3.1.1

also fixes
PR: 266727
Reported by: topical@gmx.net