### What changes were proposed in this pull request?
This PR aims to support both pandas 0.23 and 1.0.
### Why are the changes needed?
```
$ pip install pandas==0.23.2
$ python -c "import pandas.CategoricalDtype"
Traceback (most recent call last):
File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'pandas.CategoricalDtype'
$ python -c "from pandas.api.types import CategoricalDtype"
```
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Pass the Jenkins.
```
$ pip freeze | grep pandas
pandas==0.23.2
$ python/run-tests.py --python-executables python --modules pyspark-sql
...
Tests passed in 359 seconds
```
Closes#28789 from williamhyun/williamhyun-patch-2.
Authored-by: William Hyun <williamhyun3@gmail.com>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
2ab82fae57