BUG: is_utc(dateutil_utc)
- [ ] closes #xxxx
- [x] tests added / passed
- [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

can you also add a whatsnew note > can you also add a whatsnew note

updated+green odd why the 32-bit build failed: https://dev.azure.com/pandas-dev/pandas/_build/results?buildId=52841&view=logs&j=f39ddbca-85f6-5283-3bfe-05832bcf5208&t=60a5c9af-5075-529a-e870-f4d886d8e7ce > odd why the 32-bit build failed

 yah ive been seeing that occasionally recently, havent figured out whats going on there

rebased + green