[Apt] Switch to deb822 format

[nervo]

See: https://repolib.readthedocs.io/en/latest/deb822-format.html

Notes:

• Some efforts have been made to ensure a seamless transition to new .sources repositories, by automatically removing old .list ones.

Breaking Changes:

• Although legacy "source" based repositories are still supported, a file ending by .sources MUST be provided

manala_apt_repositories:
  - source: deb https://example.com foo
    file: example.sources  # <--

[greedybro]

Est-ce qu'on en profiterai pas pour trier alphabétiquement ces clés dans apt/vars/main.yaml ? 👼🏻👼🏻👼🏻
EDIT: Peut-être dans une autre PR après celle-ci pour des raisons de lisibilité de diff

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.54217% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 93.90%. Comparing base (5bfd08d) to head (480b9c1).
Report is 106 commits behind head on master.

Files	Patch %	Lines
plugins/lookup/apt_repositories.py	78.18%	8 Missing and 4 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #694      +/-   ##
==========================================
- Coverage   94.21%   93.90%   -0.31%     
==========================================
  Files         106      104       -2     
  Lines        4113     4103      -10     
  Branches      627      840     +213     
==========================================
- Hits         3875     3853      -22     
- Misses        178      186       +8     
- Partials       60       64       +4     

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