Swift 6 Compatibility

[Supereg]

Fix Swift Concurrency

♻️ Current situation & Problem

Updates the flag name.

⚙️ Release Notes

• Update swift concurrency flag name.

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[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 15 lines in your changes missing coverage. Please review.

Project coverage is 81.79%. Comparing base (3326fea) to head (6c8e5f0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
+ Coverage   81.14%   81.79%   +0.65%     
==========================================
  Files          11       11              
  Lines         281      280       -1     
==========================================
+ Hits          228      229       +1     
+ Misses         53       51       -2     

Files	Coverage Δ
Sources/SpeziFoundation/Misc/TimeoutError.swift	60.00% <100.00%> (ø)
...ces/SpeziFoundation/Semaphore/AsyncSemaphore.swift	71.54% <65.91%> (+1.25%)	⬆️

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[PSchmiedmayer]

Thank you @Supereg for fixing this!

Seems like we have a small amount of warnings (only in the tests) that will be errors in Swift 6 that surface as part of enabling this in this PR. Would be great to address them as part of this PR.

[PSchmiedmayer]

Very cool; thank you @Supereg!