Minor concurrency adjustments

[Supereg]

Minor concurrency adjustments

♻️ Current situation & Problem

With Xcode Beta 5 there are new region-based concurrency checks that trigger a warning about strongly transferred parameters (see SE-0414) when passing actor isolated closures that is not explicitly marked as @Sendable.
This PR resolves those warning by adding an explicit @Sendable annotation.

Interestingly the Swift Package Index marks Spezi 1.7.1 to be Swift 6 compatible even though they compile the project with Beta 5.

⚙️ Release Notes

• Minor concurrency adjustments.

📚 Documentation

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✅ 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 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.33%. Comparing base (87d735b) to head (24440fc).
Report is 1 commits behind head on main.

Files	Patch %	Lines
.../Spezi/Spezi/SpeziNotificationCenterDelegate.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #114   +/-   ##
=======================================
  Coverage   90.33%   90.33%           
=======================================
  Files          47       47           
  Lines        1602     1602           
=======================================
  Hits         1447     1447           
  Misses        155      155           

Files	Coverage Δ
Sources/Spezi/Spezi/SpeziAppDelegate.swift	91.16% <100.00%> (ø)
.../Spezi/Spezi/SpeziNotificationCenterDelegate.swift	5.98% <0.00%> (ø)

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[PSchmiedmayer]

Thank you @Supereg!