Add `PIPython` to python.yaml

[christophfroehlich]

Please add the following dependency to the rosdep database.

Package name:

PIPython

Package Upstream Source:

https://github.com/PI-PhysikInstrumente/PIPython

Purpose of using this:

Hardware driver package for PI controllers.

Links to Distribution Packages

• pip:
  • https://pypi.org/project/PIPython/