devel/py-pybind11, devel/pybind11: Update to 2.3.0

• Pet portlint by making the USES blocks separately with the related variables while I'm here.

Changelog:

https://github.com/pybind/pybind11/blob/v2.3.0/docs/changelog.rst

PR: 239218
Approved by: maintainer timeout (+14 days)