Log Message:
py-cftime: updated to 1.6.3

version 1.6.3 (release tag v1.6.3rel)

* add support for formats without separators in strptime (e.g. '20200229')/
  This required removing support for > 4 digit years.
* 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.