TYP/TST: tests/mypy complaints failing locally
This un-xfails-on-mac a test that is passing locally.  Also suppresses some mypy complaints.  I'm still complaints:

```
pandas/io/formats/printing.py:266: error: Incompatible types in assignment (expression has type "Tuple[Type[Dict[Any, Any]]]", base class "BaseFormatter" defined the type as "Type[str]")  [assignment]
pandas/core/dtypes/dtypes.py:865: error: Incompatible types in assignment (expression has type "Callable[[PeriodDtypeBase], int]", base class "PandasExtensionDtype" defined the type as "Callable[[PandasExtensionDtype], int]")  [assignment]
```

that I haven't found a solution for
Thanks @jbrockmendel (can follow up with the other typings maybe if it makes things simpler)