BUG: AttributeError: 'DataFrame' object has no attribute '_is_builtin_func'
- [x] I have checked that this issue has not already been reported.

- [x] I have confirmed this bug exists on the latest version of pandas.

- [ ] (optional) I have confirmed this bug exists on the master branch of pandas.

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**Note**: Please read [this guide](https://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports) detailing how to provide the necessary information for us to reproduce your bug.

#### Code Sample, a copy-pastable example


```python
# Comes from private repo, but I will paste snippets where it gives errors
data.loc[:, 'update_status'] = data.apply(
    my_function,
    func_arg=some_value    
)
```

#### Problem description

GitHub Actions started failing after July 3rd (see image below). Realized that pandas has been upgraded to 1.3.0 on July 2nd. **Reverted to pinning pandas to <= 1.2.5 and it started working again.**

![image](https://user-images.githubusercontent.com/33585645/124355972-63949480-dbd9-11eb-8c61-ed9570883136.png)


#### Expected Output

#### Output of ``pd.show_versions()``

<details>

Issue with 1.3.0 but works fine with 1.2.5

</details>
