REGR: read_pickle fallback to encoding=latin_1 upon a UnicodeDecodeError
When a reading a pickle with MultiIndex columns generated in py27
`pickle_compat.load()` with `enconding=None` would throw an UnicodeDecodeError
when reading a pickle created in py27. Now, `read_pickle` catches that exception and
fallback to use `latin-1` explicitly.

- [x] closes #31988
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

LGTM Thanks @pedroreys !