Add patch for xmlschema

Author: msimacek

graalpython/lib-graalpython/patches/metadata.toml

@@ -915,6 +915,13 @@ license = 'MIT'
 subdir = 'src'
 install-priority = 0
 
+[[xmlschema.rules]]
+version = '>= 4.0.0, <= 4.0.1'
+# Submitted upstream, optimistically assuming it'll get merged before the next release
+install-priority = 0
+patch = 'xmlschema.patch'
+license = 'MIT'
+
 [[zstandard.rules]]
 patch = 'zstandard.patch'
 license = 'BSD-3-Clause'

graalpython/lib-graalpython/patches/xmlschema.patch

@@ -0,0 +1,13 @@
+diff --git a/xmlschema/validators/builders.py b/xmlschema/validators/builders.py
+index 1ac8b8e..f39ada8 100644
+--- a/xmlschema/validators/builders.py
++++ b/xmlschema/validators/builders.py
+@@ -8,7 +8,7 @@
+ # @author Davide Brunato <brunato@sissa.it>
+ #
+ import copy
+-from _operator import itemgetter
++from operator import itemgetter
+ from abc import abstractmethod
+ from collections import Counter
+ from collections.abc import Callable, ItemsView, Iterator, Mapping, ValuesView, Iterable