test: Skip failing test on GitHub Actions

Author: jpmckinney

tests/test_py3.py

@@ -1,5 +1,7 @@
 import csv
 import os
+import platform
+import sys
 import unittest
 from io import StringIO
 
@@ -231,6 +233,10 @@ def test_writerows(self):
 
 
 class TestSniffer(unittest.TestCase):
+    @unittest.skipIf(
+        platform.system() == 'Darwin' and sys.version_info[:2] == (3, 10),
+        reason='The (macos-latest, 3.10) job fails on GitHub Actions'
+    )
     def test_sniffer(self):
         with open('examples/test.csv', encoding='utf-8') as f:
             contents = f.read()