[iOS] Exclude DerivedData from linting

[aringenbach]

Should fix this kind of failure (when Xcode / CL tools use local DerivedData folder): https://github.com/matrix-org/matrix-rich-text-editor/actions/runs/6584730655/job/17890374579?pr=850

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9d60d40) 87.77% compared to head (9b1d470) 89.43%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #853      +/-   ##
============================================
+ Coverage     87.77%   89.43%   +1.66%     
============================================
  Files           163       84      -79     
  Lines         18635    15231    -3404     
  Branches        976        0     -976     
============================================
- Hits          16357    13622    -2735     
+ Misses         2025     1609     -416     
+ Partials        253        0     -253     

Flag	Coverage Δ
uitests	?
uitests-android	?
uitests-ios	?
unittests	89.43% <ø> (+3.38%)	⬆️
unittests-android	?
unittests-ios	?
unittests-rust	89.43% <ø> (ø)

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see 79 files with indirect coverage changes

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