vendor: update buildkit to master@9624ab4

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

vendor/github.com/docker/cli/cli-plugins/manager/suffix_unix.go

@@ -6,6 +6,7 @@ package manager
 func trimExeSuffix(s string) (string, error) {
 	return s, nil
 }
+
 func addExeSuffix(s string) string {
 	return s
 }