build(deps): bump github.com/containers/storage from 1.15.7 to 1.15.8

Bumps [github.com/containers/storage](https://github.com/containers/storage) from 1.15.7 to 1.15.8.
- [Release notes](https://github.com/containers/storage/releases)
- [Changelog](https://github.com/containers/storage/blob/master/docs/containers-storage-changes.md)
- [Commits](https://github.com/containers/storage/compare/v1.15.7...v1.15.8)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

vendor/github.com/containers/storage/store.go

@@ -2783,18 +2783,24 @@ func (s *store) ContainerParentOwners(id string) ([]int, []int, error) {
 }
 
 func (s *store) Layers() ([]Layer, error) {
-	var layers []Layer
 	lstore, err := s.LayerStore()
 	if err != nil {
 		return nil, err
 	}
+	if err := lstore.LoadLocked(); err != nil {
+		return nil, err
+	}
+	layers, err := lstore.Layers()
+	if err != nil {
+		return nil, err
+	}
 
 	lstores, err := s.ROLayerStores()
 	if err != nil {
 		return nil, err
 	}
 
-	for _, s := range append([]ROLayerStore{lstore}, lstores...) {
+	for _, s := range lstores {
 		store := s
 		store.RLock()
 		defer store.Unlock()