- update to 1.6.3:
* add support for formats without separators in strptime (e.g.
'20200229', issue #301).
* set the c_api_binop_methods compiler directive to True to
retain Cython 0.x behavior for arithmetic operators for
Cython >= 3.0.0
* support for python 3.12.
- drop cython3.patch (upstream)

- Update to version 1.6.2
* silently change calendar='gregorian' to 'standard' internally,
* added support for "common_year" and "common_years" units for "noleap"
Default is False for 'real-world' calendars ('julian', 'gregorian'/'standard',
* add "change_calendar" cftime.datetime method to switch to another
* remove legacy `utime` class, and legacy `JulianDayFromDate` and
`cftime.datetime.__add__`, and `cftime.datetime.__sub__`. The use of them
* Rewrite of julian day/calendar functions (_IntJulianDayToCalendar and
changed to MIT (to be consistent with netcdf4-python).
digits can be handled.
* include pyproject.toml in MANIFEST.in so it gets
* fix for date2num error when converting a DatetimeProlepticGregorian