Use python3 not python

As per https://peps.python.org/pep-0394/, the python binary can be one
of the following options:
- Python 2
- Python 3
- Not exist

All of the scripts in libxml2 use 'python', which may not exist.

As Python 2 reached EOL on the 1st January 2020, it's safe to move the
scripts to use python3 explicitly.

1 files changed, 1 insertions, 1 deletions

diff --git a/check-relaxng-test-suite2.py b/check-relaxng-test-suite2.py
index 559503a1..5f286ce2 100755
--- a/check-relaxng-test-suite2.py
+++ b/check-relaxng-test-suite2.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 import sys
 import time
 import os