devel/py-tzdata: Update to 2023.2

• Switch to PEP517 build framework and remove the no longer required workaround for setuptools.

Changelogs since 2022.7:

https://github.com/python/tzdata/releases/tag/2023.3
https://github.com/python/tzdata/releases/tag/2023.2
https://github.com/python/tzdata/releases/tag/2023.1

MFH: No (PEP517 support not present in 2023Q1)