[Merge] ~nteodosio/update-manager:mantic-ua into update-manager:main

[Nathan Teodosio]

Nathan Teodosio has proposed merging ~nteodosio/update-manager:mantic-ua into update-manager:main.

Requested reviews:
  Sebastien Bacher (seb128)

For more details, see:
https://code.launchpad.net/~nteodosio/update-manager/+git/update-manager/+merge/453888

Fixes linter errors for autopkgtests.

Build: https://launchpad.net/~nteodosio/+archive/ubuntu/ubuntu-pro/+sourcepub/15217718/+listing-archive-extra

--->
% ppa tests ubuntu-pro
  - update-manager/1:23.10.5
    + ✅ update-manager on mantic for amd64   @ 18.10.23 08:23:13  Log️ 🗒️
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