The release tag client/v8.7.0 is for VolumeSnapshot and VolumeGroupSnapshot APIs and client library which are in a separate go package.

Changes by Kind

Cleanup

• Enabled the VolumeGroupSnapshot feature gate. (#1475, @xing-yang)

Full Changelog

https://github.com/kubernetes-csi/external-snapshotter/blob/v8.7.0/CHANGELOG/CHANGELOG-8.7.md