Add tests for error message

Author: rhshadrach

pandas/tests/tslibs/test_timezones.py

@@ -19,6 +19,7 @@
 from pandas import Timestamp
 
 
+@pytest.mark.single_cpu
 def test_no_timezone_data():
     # https://github.com/pandas-dev/pandas/pull/63335
     # Test error message when timezone data is not available.