more portable shebangs

This is useful on systems like NixOS, where python3 is not in
/usr/bin/python3 as well as for people using alternative ways to
install python such as virtualenv/pyenv.

Some scripts where already using '/usr/bin/env'. With this pull request
it gets more consistent. For background information see also:
https://github.com/systemd/systemd/pull/5816

1 files changed, 1 insertions, 1 deletions

diff --git a/test/Concrete/ConcreteTest.py b/test/Concrete/ConcreteTest.py
index 66d18c83..57ea77d2 100755
--- a/test/Concrete/ConcreteTest.py
+++ b/test/Concrete/ConcreteTest.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 from __future__ import print_function
 import argparse