Bump github.com/containers/storage from 1.20.2 to 1.21.0

Bumps [github.com/containers/storage](https://github.com/containers/storage) from 1.20.2 to 1.21.0.
- [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/v1.20.2...v1.21.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/vendor/github.com/hashicorp/go-multierror/group.go b/vendor/github.com/hashicorp/go-multierror/group.go
new file mode 100644
index 000000000..9c29efb7f
--- /dev/null
+++ b/vendor/github.com/hashicorp/go-multierror/group.go
@@ -0,0 +1,38 @@
+package multierror
+
+import "sync"
+
+// Group is a collection of goroutines which return errors that need to be
+// coalesced.
+type Group struct {
+	mutex sync.Mutex
+	err   *Error
+	wg    sync.WaitGroup
+}
+
+// Go calls the given function in a new goroutine.
+//
+// If the function returns an error it is added to the group multierror which
+// is returned by Wait.
+func (g *Group) Go(f func() error) {
+	g.wg.Add(1)
+
+	go func() {
+		defer g.wg.Done()
+
+		if err := f(); err != nil {
+			g.mutex.Lock()
+			g.err = Append(g.err, err)
+			g.mutex.Unlock()
+		}
+	}()
+}
+
+// Wait blocks until all function calls from the Go method have returned, then
+// returns the multierror.
+func (g *Group) Wait() *Error {
+	g.wg.Wait()
+	g.mutex.Lock()
+	defer g.mutex.Unlock()
+	return g.err
+}