sysutils/yadm: update to 2.2.0

ChangeLog: https://github.com/TheLocehiliosan/yadm/releases/tag/2.2.0

Accumulated changes since 2.0.1:

• Use relative symlinks for alternates
• Support double-star globs in .config/yadm/encrypt
• Improve bash completion
• Update docs about using magit
• Note exception for WSL
• Resolve hostname using uname -n
• Use /etc/os-release if lsb_release is missing
• Issue warning for any invalid alternates found
• Add support for gawk

PR: 242469
Submitted by: vendion@gmail.com
Reviewed by: alex@xanderio.de (maintainer)