net/td-system-tools: Update 2.6.4 => 2.7.4

Changelog:
https://github.com/dreibh/system-tools/blob/td-system-tools-2.7.4/ChangeLog

Commit log:
https://github.com/dreibh/system-tools/compare/td-system-tools-2.6.4...td-system-tools-2.7.4

PR: 295751
Sponsored by: UNIS Labs
Co-authored-by: Vladimir Druzenko <vvd@FreeBSD.org>