build(linux): fix new lint errors

[ReenigneArcher]

Description

Fixes new linting errors caused by:

• Homebrew/brew@7bf7030
• screenshots: Add a separate error for missing screenshots in metainfo flathub-infra/flatpak-builder-lint#454 (probably?)

Screenshot

Issues Fixed or Closed

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 9.57%. Comparing base (444ca98) to head (70481f0).

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #2953   +/-   ##
======================================
  Coverage    9.57%   9.57%           
======================================
  Files          97      97           
  Lines       17582   17582           
  Branches     8336    8336           
======================================
  Hits         1683    1683           
- Misses      13006   13011    +5     
+ Partials     2893    2888    -5     

Flag	Coverage Δ
Linux	6.95% <ø> (ø)
Windows	5.08% <ø> (ø)
macOS-12	10.29% <ø> (ø)
macOS-13	10.20% <ø> (-0.02%)	⬇️
macOS-14	10.52% <ø> (ø)

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see 25 files with indirect coverage changes