API: ``bool_only`` in any/all still defaults to None

[phofl]

Shouldn't we change this to be consistent with numeric_only?

cc @rhshadrach was this deliberately not changed before 2.0?

[rhshadrach]

Yep - this was missed when grepping for numeric_only. Thanks.

[phofl]

lets deprecate then and change in 3.0

[rhshadrach]

I believe None behaves the same as False, so there isn't any difference from a user perspective. I think we can target this for 2.1.