www/py-django-timezone-field: Update to 4.2.3
- Introduce new default option REST which adds support for field serialization.
Changelog:
https://github.com/mfogel/django-timezone-field/compare/4.1.2...4.2.3
MFH: 2022Q1
(cherry picked from commit 37629653c395741857e6cd3d5612db82d2d2bb12)