[gimp-help/wip/wormnest/ci] tools: fix ci python3 not found

[Jacob Boerema <jboerema src gnome org>]

commit 5ebfed47b14eca6914534cb742c8144acf0fc57f
Author: Jacob Boerema <jgboerema gmail com>
Date:   Wed Jun 2 17:21:52 2021 -0400

    tools: fix ci python3 not found

 tools/xml2po.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/tools/xml2po.py b/tools/xml2po.py
index 5740a5d48..b2b92c12b 100755
--- a/tools/xml2po.py
+++ b/tools/xml2po.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
 # -*- encoding: utf-8 -*-
 # Copyright (c) 2004, 2005, 2006 Danilo Šegan <danilo gnome org>.
 # Copyright (c) 2009 Claude Paroz <claude 2xlibre net>.