Fixes Crashing When Using Background Requests

[PSchmiedmayer]

Fixes Crashing When Using Background Requests

♻️ Current situation & Problem

• if a developer uses multiple HealthKit queries in the background data races accessing the tracked background activations can lead to runtime crashes.

⚙️ Release Notes

• Fixes the issue using additional locking mechanisms

📝 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: 14 lines in your changes are missing coverage. Please review.

Comparison is base (d882734) 70.20% compared to head (f1a64a7) 69.90%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
- Coverage   70.20%   69.90%   -0.30%     
==========================================
  Files          11       11              
  Lines         453      455       +2     
==========================================
  Hits          318      318              
- Misses        135      137       +2     

Files	Coverage Δ
...lthKit Extensions/HKHealthStore+Observations.swift	68.58% <17.65%> (-2.01%)	⬇️

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