DOC: unpin IPython version (GH13639)
## [Current coverage](https://codecov.io/gh/pydata/pandas/pull/14037?src=pr) is 85.25% (diff: 100%)

> No coverage report found for **master** at 453bc26.
> 
> Powered by [Codecov](https://codecov.io?src=pr). Last update [453bc26...76594f5](https://codecov.io/gh/pydata/pandas/compare/453bc26e07ebbfea33dda9ff2f4efab683718506...76594f56655694a0a0bcb542d7c9b06c46e83118?src=pr)
