fix test on py<311

Author: jakkdl

testing/python/raises_group.py

@@ -1145,6 +1145,8 @@ def test_xfail_raisesgroup(pytester: Pytester) -> None:
     pytester.makepyfile(
         """
         import pytest
+        if sys.version_info < (3, 11):
+            from exceptiongroup import ExceptionGroup
         @pytest.mark.xfail(raises=pytest.RaisesGroup(ValueError))
         def test_foo() -> None:
             raise ExceptionGroup("foo", [ValueError()])

tox.ini

@@ -107,8 +107,8 @@ allowlist_externals =
   git
 commands =
     # Retrieve possibly missing commits:
-    -git fetch --unshallow
-    -git fetch --tags
+    #-git fetch --unshallow
+    #-git fetch --tags
 
     sphinx-build \
       -j auto \