TST: Fixed xfail for tests in pandas/tests/tseries/offsets/test_offsets_properties.py
- [x] ref https://github.com/pandas-dev/pandas/pull/32459#issuecomment-595277125
- [ ] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

```mypy``` is failing? looks like the build logs have expired; can you rebase and we'll see if this is ready Couple of comments, looks nearly there ```
=================================== FAILURES ===================================
_______________________ test_apply_index_implementations _______________________
[gw1] linux -- Python 3.6.10 /home/vsts/miniconda3/envs/pandas-dev/bin/python

    @given(gen_yqm_offset, gen_date_range)
>   def test_apply_index_implementations(offset, rng):

pandas/tests/tseries/offsets/test_offsets_properties.py:99: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
pandas/core/indexes/datetimes.py:974: in date_range
    **kwargs,
pandas/core/arrays/datetimes.py:412: in _generate_range
    index.asi8, tz, ambiguous=ambiguous, nonexistent=nonexistent
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

>   raise pytz.NonExistentTimeError(stamp)
E   pytz.exceptions.NonExistentTimeError: 1991-03-31 00:04:11.080387

pandas/_libs/tslibs/tzconversion.pyx:276: NonExistentTimeError
``` Is this still active?  closing as stale; if you can continue pls ping / open a new PR.