Bump github.com/opencontainers/selinux from 1.8.5 to 1.9.1

Bumps [github.com/opencontainers/selinux](https://github.com/opencontainers/selinux) from 1.8.5 to 1.9.1.
- [Release notes](https://github.com/opencontainers/selinux/releases)
- [Commits](https://github.com/opencontainers/selinux/compare/v1.8.5...v1.9.1)

---
updated-dependencies:
- dependency-name: github.com/opencontainers/selinux
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/github.com/opencontainers/selinux/pkg/pwalkdir/pwalkdir.go

@@ -1,3 +1,4 @@
+//go:build go1.16
 // +build go1.16
 
 package pwalkdir
@@ -51,6 +52,9 @@ func WalkN(root string, walkFn fs.WalkDirFunc, num int) error {
 	var (
 		err error
 		wg  sync.WaitGroup
+
+		rootLen   = len(root)
+		rootEntry *walkArgs
 	)
 	wg.Add(1)
 	go func() {
@@ -59,6 +63,11 @@ func WalkN(root string, walkFn fs.WalkDirFunc, num int) error {
 				close(files)
 				return err
 			}
+			if len(p) == rootLen {
+				// Root entry is processed separately below.
+				rootEntry = &walkArgs{path: p, entry: entry}
+				return nil
+			}
 			// Add a file to the queue unless a callback sent an error.
 			select {
 			case e := <-errCh:
@@ -92,6 +101,10 @@ func WalkN(root string, walkFn fs.WalkDirFunc, num int) error {
 
 	wg.Wait()
 
+	if err == nil {
+		err = walkFn(rootEntry.path, rootEntry.entry, nil)
+	}
+
 	return err
 }