tools: fix shebang to use python3 by default

PR-URL: #44531
Reviewed-By: Feng Yu <[email protected]>
Reviewed-By: Christian Clauss <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Minwoo Jung <[email protected]>
Reviewed-By: Darshan Sen <[email protected]>

tools/test.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2008 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without