BUG: convert_dtypes incorrectly converts byte strings to strings in 1.3+
- [x] closes #43183
- [x] tests added / passed in the test_convert_dtypes.py file
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [x] whatsnew entry

Added extra try except block to identify the correct type to solve the problem.