Resample fix dst transition
Fix bug when resampling with DST transition.

- [x] closes #35219
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

thanks @Flix6x very nice. happy for you to tackle other resample issues (or any others!)