Plasma-nm: passing on maintainership

[Rajeesh K V]

> I will still be around, mostly working on things around Flatpak, PipeWire, etc.

Your contributions are much appreciated, Jan. Thank  you (and
Lamarque) also for helping me to integrate some VPN plugins, bluetooth
tethering  support etc. into plasma-nm; and also for bringing back the
network speed plotter during our chat at Akademy 2015 :-)

--
Regards,
Rajeesh