COMPAT: Update for NumPy dev
Closes https://github.com/pandas-dev/pandas/issues/17986

xref https://github.com/numpy/numpy/pull/9487

Do we want this for 0.21?
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=h1) Report
> Merging [#17987](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/36c309ed51b98e97fb64238232ecdc795040ad24?src=pr&el=desc) will **increase** coverage by `0.33%`.
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/17987/graphs/tree.svg?src=pr&token=eZ4WkYLtcO&width=650&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #17987      +/-   ##
==========================================
+ Coverage   91.23%   91.57%   +0.33%     
==========================================
  Files         163      163              
  Lines       50113    53390    +3277     
==========================================
+ Hits        45723    48892    +3169     
- Misses       4390     4498     +108
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.52% <100%> (+0.48%)` | :arrow_up: |
| #single | `41.01% <0%> (+0.64%)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/packers.py](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=tree#diff-cGFuZGFzL2lvL3BhY2tlcnMucHk=) | `88.3% <100%> (+0.1%)` | :arrow_up: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/categorical.py](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvY2F0ZWdvcmljYWwucHk=) | `95.44% <0%> (-0.29%)` | :arrow_down: |
| [pandas/core/panel4d.py](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvcGFuZWw0ZC5weQ==) | `100% <0%> (ø)` | :arrow_up: |
| [pandas/core/internals.py](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW50ZXJuYWxzLnB5) | `94.77% <0%> (+0.31%)` | :arrow_up: |
| [pandas/core/panel.py](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvcGFuZWwucHk=) | `97.39% <0%> (+0.43%)` | :arrow_up: |
| [pandas/core/generic.py](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZ2VuZXJpYy5weQ==) | `93.06% <0%> (+0.52%)` | :arrow_up: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `98.54% <0%> (+0.69%)` | :arrow_up: |
| [pandas/core/ops.py](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvb3BzLnB5) | `92.99% <0%> (+1.21%)` | :arrow_up: |
| [pandas/core/reshape/concat.py](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvcmVzaGFwZS9jb25jYXQucHk=) | `98.84% <0%> (+1.26%)` | :arrow_up: |
| ... and [2 more](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=tree-more) | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=footer). Last update [36c309e...cb0101b](https://codecov.io/gh/pandas-dev/pandas/pull/17987?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 Huh, must have deleted that branch accidentally. thanks!