Merge #192506: modemmanager: 1.18.10 -> 1.18.12

...into staging
Otherwise we'd most likely suffer from the crashes due to glib update:
https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/blob/1.18.12/NEWS

pkgs/tools/networking/modemmanager/default.nix

···
 
 stdenv.mkDerivation rec {
   pname = "modemmanager";
-  version = "1.18.10";
+  version = "1.18.12";
 
   src = fetchurl {
     url = "https://www.freedesktop.org/software/ModemManager/ModemManager-${version}.tar.xz";
-    sha256 = "sha256-FiVfginu6y3+y43RNwNg1G8QFeyF5vulwcvZ9DcdZes=";
+    sha256 = "sha256-tGTkkl2VWmyobdCGFudjsmrkbX/Tfb4oFnjjQGWx5DA=";
   };
 
   patches = [