[Release notes] Suomenlinna 4.3.0

[jovirkku]

@klemolap

I did a factory reset and downloaded all versions from 2.0.x all the way (6-7 updates) to 4.2.0.21

It would be easier to download 4.2.0.21 (or 4.3.0.12 when it becomes available) and flash that to the phone.