devel/git-who: Update 1.1 => 1.2

Changelog:
https://github.com/sinclairtarget/git-who/releases/tag/v1.2

While here, don't specify a go version since go is backwards-compatible,
and fix unknown version problem on git-who -version command.

Add devel/git to RUN_DEPENDS

PR: 288557
Approved by: yuri@ (Mentor)