sysutils/vtm: Update 2025.05.21 => 2025.05.28
Changelogs:
https://github.com/directvt/vtm/releases/tag/v2025.05.27
https://github.com/directvt/vtm/releases/tag/v2025.05.28
Add record to pkg-message about incompatibility with previous versions.
PR: 287159