Mark the failing test as xfail

tests/unit/test_models_wheel.py

@@ -93,6 +93,14 @@ class TestWheelFile(object):
         w = Wheel('simple-0.1-cp27-none-macosx_10_9_intel.whl')
         assert not w.supported(tags=tags)
 
+    @pytest.mark.xfail(
+        reason=(
+            "packaging.tags changed behaviour in this area, and @pradyunsg "
+            "decided as the release manager that this behaviour change is less "
+            "critical than Big Sur support for pip 20.3. See "
+            "https://github.com/pypa/packaging/pull/361 for further discussion."
+        )
+    )
     def test_supported_multiarch_darwin(self):
         """
         Multi-arch wheels (intel) are supported on components (i386, x86_64)