Revert "CI: pin jemalloc=4.4.0 (#16727)"
This reverts commit 09d8c22d9f56f4a067880a28fbb1235bcf0a1e49.

closes #16729

What's the status of this? # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16731?src=pr&el=h1) Report
> Merging [#16731](https://codecov.io/gh/pandas-dev/pandas/pull/16731?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/5e776fb6cf4e7b3ae0f36b480e1f4e5da154b313?src=pr&el=desc) will **decrease** coverage by `0.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/16731/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/16731?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #16731      +/-   ##
==========================================
- Coverage   90.95%   90.94%   -0.02%     
==========================================
  Files         161      161              
  Lines       49264    49264              
==========================================
- Hits        44810    44801       -9     
- Misses       4454     4463       +9
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.71% <ø> (ø)` | :arrow_up: |
| #single | `40.17% <ø> (-0.07%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/16731?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/16731?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/16731?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.66% <0%> (-0.1%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16731?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/16731?src=pr&el=footer). Last update [5e776fb...e1cf5eb](https://codecov.io/gh/pandas-dev/pandas/pull/16731?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16731?src=pr&el=h1) Report
> Merging [#16731](https://codecov.io/gh/pandas-dev/pandas/pull/16731?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/5e776fb6cf4e7b3ae0f36b480e1f4e5da154b313?src=pr&el=desc) will **decrease** coverage by `0.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/16731/graphs/tree.svg?height=150&token=eZ4WkYLtcO&width=650&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/16731?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #16731      +/-   ##
==========================================
- Coverage   90.95%   90.94%   -0.02%     
==========================================
  Files         161      161              
  Lines       49264    49264              
==========================================
- Hits        44810    44801       -9     
- Misses       4454     4463       +9
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.71% <ø> (ø)` | :arrow_up: |
| #single | `40.17% <ø> (-0.07%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/16731?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/16731?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/16731?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.66% <0%> (-0.1%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/16731?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/16731?src=pr&el=footer). Last update [5e776fb...e1cf5eb](https://codecov.io/gh/pandas-dev/pandas/pull/16731?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
