Revert "BLD: fix numpy on 2.7 build as 1.13 was released but no deps are built for it
xref #16650
xref #16634 

This reverts commit 789f7bbb52f279bd1ed53abf1a9580f682c2d6b9.

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16688?src=pr&el=h1) Report
> Merging [#16688](https://codecov.io/gh/pandas-dev/pandas/pull/16688?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/d298414d2724fed40254350117adcabc4e546e48?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/16688/graphs/tree.svg?height=150&width=650&token=eZ4WkYLtcO&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/16688?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #16688   +/-   ##
=======================================
  Coverage   90.95%   90.95%           
=======================================
  Files         161      161           
  Lines       49276    49276           
=======================================
  Hits        44817    44817           
  Misses       4459     4459
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.71% <ø> (ø)` | :arrow_up: |
| #single | `40.18% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16688?src=pr&el=continue).
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> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16688?src=pr&el=footer). Last update [d298414...a5bc635](https://codecov.io/gh/pandas-dev/pandas/pull/16688?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
