lint: fix lint issues with newer ruff

[lengau]

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---

A ruff update that added some more checks and a PR being merged around the same time left us with linting issues.

[codecov[bot]]

Codecov Report

Merging #33 (949ae2f) into main (32fc17f) will not change coverage. The diff coverage is 50.00%.

@@           Coverage Diff           @@
##             main      #33   +/-   ##
=======================================
  Coverage   78.42%   78.42%           
=======================================
  Files          11       11           
  Lines         496      496           
  Branches      110      110           
=======================================
  Hits          389      389           
  Misses         76       76           
  Partials       31       31           

Impacted Files	Coverage Δ
craft_archives/repo/apt_key_manager.py	95.18% <ø> (ø)
craft_archives/utils.py	37.77% <0.00%> (ø)
craft_archives/repo/package_repository.py	78.43% <100.00%> (ø)

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[syu-w]

I think we need a few simple tests for this?

[lengau]

Yeah unit tests here are probably worth adding, but out of scope for this PR. I've made CRAFT-1641 for it.

@sergiusens can you override the codecov failure and merge?