ModemManager update

[Lech Perczak]

Hey Artur, Aleksander,

I think your best bet is compiling .deb's based on source files 
available from Sid:
https://packages.debian.org/sid/libqmi-glib5
https://packages.debian.org/sid/libmbim-glib4
https://packages.debian.org/sid/modemmanager

These are IIRC the latest release, or very close to.  I managed to 
successfully compile those against current stable (Bullseye) - they run 
well. You'll have to compile them in that order, as usually don for 
Debian packages, because of dependencies, and install respective -dev 
packages to build the next ones.

Installing packages directly from Sid won't work, as required glibmm is 
too new for Bullseye.

Kind regards,
Lech