[Development] CI Jenkins will be updated today

[Sarajärvi Tony]

>Hi
>
>We will update Jenkins to hopefully a more stable version. We have tried it already on dev side and the update process went fine.
>
>The update will happen after the current qt5 release integration build, which will occur around noon, i.e. in 3 hours or so.
>

We already began the update process. Have to sort out new errors with Groovy scripts that seem to cause builds to fail. 

-Tony