pyexpat 2.6.0 is not vulnerable to the XML entity expansion attack, so we can...

pyexpat 2.6.0 is not vulnerable to the XML entity expansion attack, so we can drop this equals sign. Thanks, Florian!

diffoscope/comparators/xml.py

@@ -57,7 +57,7 @@ def is_vulnerable_xml_parser():
         int(x) for x in pyexpat.EXPAT_VERSION.split("_", 1)[1].split(".")
     )
 
-    return pyexpat_version <= (2, 6, 0)
+    return pyexpat_version < (2, 6, 0)
 
 
 def _format(node):