astro/py-ephem: Update to 4.2.1

• First release that offers wheels for Python 3.14
• Star database now makes the star Albereo available under its more official spelling Albireo
• Classes like Sun and Mercury are now defined using plain literal class statements, instead of being built dynamically in a for loop. This should make the classes visible to tools like editors, debuggers, and type checkers.

Strip had to be changed from PYTHON_TAG to PYTHON_SUFFIX in order to
also support threaded Python versions (3.13t).

Changelog: https://github.com/brandon-rhodes/pyephem/blob/master/ephem/doc/CHANGELOG.rst#version-421-2026-february-28

Reported by: Repology
MFH: 2026Q1