Support Swift 6 language mode

[philippzagar]

Support Swift 6 language mode

♻️ Current situation & Problem

SpeziChat currently does not support Swift 6 language mode with complete concurrency checking.

Addresses #15

⚙️ Release Notes

• Support Swift 6 language mode
• Lift dependencies
• Fix UI tests on iOS and macOS

📚 Documentation

Necessary workarounds regarding the MainActor documented

✅ Testing

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📝 Code of Conduct & Contributing Guidelines

By submitting creating this pull request, you agree to follow our Code of Conduct and Contributing Guidelines:

• I agree to follow the Code of Conduct and Contributing Guidelines.

[codecov]

Codecov Report

Attention: Patch coverage is 69.23077% with 4 lines in your changes missing coverage. Please review.

Project coverage is 80.47%. Comparing base (2fa1a93) to head (1bcf50f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/SpeziChat/ChatView.swift	69.24%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
- Coverage   80.69%   80.47%   -0.21%     
==========================================
  Files          15       15              
  Lines         756      768      +12     
==========================================
+ Hits          610      618       +8     
- Misses        146      150       +4     

Files with missing lines	Coverage Δ
Sources/SpeziChat/ChatView+ShareSheet.swift	69.24% <ø> (ø)
.../SpeziChat/Helpers/MessageInputViewHeightKey.swift	50.00% <ø> (ø)
...peziChat/Models/ChatEntity+HiddenMessageType.swift	100.00% <ø> (ø)
Sources/SpeziChat/ChatView.swift	65.22% <69.24%> (+0.22%)	⬆️

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[LeonNissen]

Great work! 🚀