Disable unstable test (#20996)

Disable unstable test in vendored package. Only used for s3 select.

internal/s3select/jstream/scanner_test.go

@@ -16,6 +16,7 @@ var (
 )
 
 func TestScanner(t *testing.T) {
+	t.Skip("Unstable test")
 	data := []byte("abcdefghijklmnopqrstuvwxyz0123456789")
 
 	var i int