docs(CHANGES): libvcs v0.28.0 update

Author: tony

CHANGES

@@ -21,6 +21,14 @@ $ pipx install --suffix=@next 'vcspull' --pip-args '\--pre' --force
 
 <!-- Maintainers, insert changes / features for the next release here -->
 
+_Maintenance only, no bug fixes or new features_
+
+### Breaking changes
+
+- libvcs: 0.27.0 -> 0.28.0 (#437)
+
+  QueryList generic typing improvements.
+
 ## vcspull v1.27.0 (2024-02-07)
 
 _Maintenance only, no bug fixes, or new features_