DEPR: datetimelike.astype(int_other_than_i8) return requested dtype
- [ ] closes #xxxx
- [x] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit) for how to run them
- [x] whatsnew entry

xref #45034 this should be just non-controversial parts of that discussion cc @jorisvandenbossche 
dont' we have an issue about this? e.g. can you add the xref to the top Thanks!