Update go.mod and vendor

vendor/github.com/moby/buildkit/snapshot/localmounter_windows.go

@@ -1,26 +0,0 @@
-package snapshot
-
-import (
-	"os"
-
-	"github.com/containerd/containerd/mount"
-)
-
-func (lm *localMounter) Unmount() error {
-	lm.mu.Lock()
-	defer lm.mu.Unlock()
-
-	if lm.target != "" {
-		if err := mount.Unmount(lm.target, 0); err != nil {
-			return err
-		}
-		os.RemoveAll(lm.target)
-		lm.target = ""
-	}
-
-	if lm.release != nil {
-		return lm.release()
-	}
-
-	return nil
-}