TST: Un-xfail tests on numpy-dev
- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [ ] whatsnew entry

Makes 3.8 npdev green. 
@simonjayhawkins @jreback are we still in a merge moratorium?  i think this fixes one of our broken builds no this is fine (just needing to backport any 1.3 things) @meeseeksdev backport 1.3.x Something went wrong ... Please have  a look at my logs. @meeseeksdev backport 1.2.x Owee, I'm MrMeeseeks, Look at me.

There seem to be a conflict, please backport manually. Here are approximate instructions:

1. Checkout backport branch and update it.

```
$ git checkout 1.2.x
$ git pull
```

2. Cherry pick the first parent branch of the this PR on top of the older branch:
```
$ git cherry-pick -m1 e3d57c983ba9c9e5ba659f48b1821d929a6a6c16
```

3. You will likely have some merge/cherry-pick conflict here, fix them and commit:

```
$ git commit -am 'Backport PR #41987: TST: Un-xfail tests on numpy-dev'
```

4. Push to a named branch :

```
git push YOURFORK 1.2.x:auto-backport-of-pr-41987-on-1.2.x
```

5. Create a PR against branch 1.2.x, I would have named this PR:

> "Backport PR #41987 on branch 1.2.x"

And apply the correct labels and milestones.

Congratulation you did some good work ! Hopefully your backport PR will be tested by the continuous integration and merged soon!

If these instruction are inaccurate, feel free to [suggest an improvement](https://github.com/MeeseeksBox/MeeseeksDev).
                