[Bug 1951985] [NEW] Fix some instances of deprecated code

[Gunnar Hjalmarsson]

Public bug reported:

Attached please find the noise exposed if you run this command in
terminal:

PYTHONWARNINGS=d gnome-language-selector

** Affects: aptdaemon (Ubuntu)
     Importance: Low
     Assignee: Gunnar Hjalmarsson (gunnarhj)
         Status: In Progress

** Affects: language-selector (Ubuntu)
     Importance: Low
     Assignee: Gunnar Hjalmarsson (gunnarhj)
         Status: In Progress

** Attachment added: "PYTHONWARNINGS.txt"
   https://bugs.launchpad.net/bugs/1951985/+attachment/5542860/+files/PYTHONWARNINGS.txt

** Also affects: aptdaemon (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: aptdaemon (Ubuntu)
   Importance: Undecided => Low

** Changed in: aptdaemon (Ubuntu)
       Status: New => In Progress

** Changed in: aptdaemon (Ubuntu)
     Assignee: (unassigned) => Gunnar Hjalmarsson (gunnarhj)

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https://bugs.launchpad.net/bugs/1951985

Title:
  Fix some instances of deprecated code

Status in aptdaemon package in Ubuntu:
  In Progress
Status in language-selector package in Ubuntu:
  In Progress

Bug description:
  Attached please find the noise exposed if you run this command in
  terminal:

  PYTHONWARNINGS=d gnome-language-selector

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https://bugs.launchpad.net/ubuntu/+source/aptdaemon/+bug/1951985/+subscriptions