security/lego: Update 4.25.2 => 4.26.0

Changelog:
https://github.com/go-acme/lego/blob/v4.26.0/CHANGELOG.md

• Fix using custom user.
• Optimize post-install - reduce MKDIR and INSTALL_SCRIPT calls.
• Fix user parametrization in periodic script.

PR: 289636
Co-authored-by: Vladimir Druzenko <vvd@FreeBSD.org>