sysutils/yadm: Update to 3.0.2

• Improve handling of submodules at upgrade
• Improve Zsh completions
• Use stderr for error messages
• Fix parsing by sh

Changelogs:

• https://github.com/TheLocehiliosan/yadm/releases/tag/3.0.1
• https://github.com/TheLocehiliosan/yadm/releases/tag/3.0.2

PR: 252545
Submitted by: Adam Jimerson <vendion@gmail.com> (maintainer)
Approved by: arrowd, tcberner (mentors, implicit)