devel/py-RPyC: Update to 4.1.2

• Update distinfo and PORTVERSION
• Pet portlint while here

RPyC 4.x.x is not completely backwards compatible with RPyC 3.x.x.
Backward incompatibilities list can be found at:
https://rpyc.readthedocs.io/en/latest/changelog.html#backward-incompatibilities

Relnotes: https://rpyc.readthedocs.io/en/latest/changelog.html
Sponsored by: Intel Corporation