CI: temp skip BooleanArray pyarrow test
This is a failure from https://github.com/pandas-dev/pandas/pull/29961, sorry. In hindsight I should have updated that PR with master after the CI changes were merged, since I added pyarrow 0.15 to one of the CI builds earlier today exactly to catch those errors .. Sorry about that.

Will merge this quickly to not have CI fail annoyingly, but will do a proper fix (for this and https://github.com/pandas-dev/pandas/issues/29976) tomorrow