BUG: DataFrame.explode is failing on scalar int value.
closes #43314 

The **int** datatype of the column was raising this issue.

- [x] closes #xxxx
- [ ] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [ ] whatsnew entry

@shubh242 can you aslo add a whatsnew note in 1.3.3, put in the bug fix reshaping section is ok > put in the bug fix reshaping section is ok

@shubh242  in the 1.3.x release notes we don't have the subsections. so just add to the regressions section. @shubh242 are you interested in continuing? > @shubh242 are you interested in continuing?

Yes i would like to give it another try. Can you be specific about what is failing by doing the change. Please adress the review comments above  @shubh242 this PR is not yet ready (needs release note and tests) and planning a release tomorrow, moving to 1.3.4 milestone. @shubh242 if you can update to comments and merge master superseded by https://github.com/pandas-dev/pandas/pull/43802