devel/ipython: add missing runtime dependency

Add missing dependency upon matplotlib-inline, that was introduced
in IPython 7.23 [1], but was overlooked in recent port update.

[1] https://ipython.readthedocs.io/en/latest/whatsnew/version7.html?ipython-7-23#ipython-7-23

PR: 255743
Reported by: p5B2E9A8F@t-online.de
With hat: python