TST: Use compatible time zones (#13186)
- resolves #13186, allowing `pandas.tests.series.test_timeseries.TestSeriesTimeSeries.test_getitem_setitem_datetime_tz_dateutil` to pass on platforms that do not supply zoneinfo for, e.g., "US/Central".

The test failures in Travis are all unrelated to the code affected by this change.

pls fix the linting
 thanks @neirbowj 
