Draft: New upstream version 1.31.6

Similar to libqmi this is a develpment snapshot to prepare for the upcoming MM 1.24 release.

I've used non conflicting branches as requested for the libqmi upload (but not pushed to the blessed repo but only my fork yet)

Set as draft as that is meant to stay as debian/experimental

@a-wai @debacle o.k. to push that to the blessed repo and upload?