BUG: get_loc with time object matching NaT micros
- [ ] closes #xxxx
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

@simonjayhawkins any idea what to do about this:

```
Performing static analysis using mypy
pandas/core/indexes/datetimes.py:781: error: "DatetimeIndex" has no attribute "tz_convert"
Found 1 error in 1 file (checked 1024 source files)
``` > @simonjayhawkins any idea what to do about this:

see #34630 cool