File docbook-xsl-stylesheets-fix-python3.patch of Package mingw64-docbook-xsl-stylesheets

--- docbook-xsl-1.78.1/extensions/xslt.py.orig	2025-05-14 15:34:30.987799313 +0200
+++ docbook-xsl-1.78.1/extensions/xslt.py	2025-05-14 15:34:40.491771136 +0200
@@ -1,4 +1,4 @@
-#!/usr/bin/python -u
+#!/usr/bin/python3 -u
 # $Id: xslt.py 8353 2009-03-17 16:57:50Z mzjn $
 
 import sys