Remove backported method

[swhitty]

Xcode 14.1 @backdeploy's URLSession.data(for:delegate:) to iOS 13 so the fallback method can now be compiled only on Linux/Windows. macOS builds can always use the Foundation version.

Adds @spi(Private) version of AllocatedLock to FlyingSocks making a fast cross platform lock implementation available for all platforms.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.35%. Comparing base (4aaf2f6) to head (d22f3c7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #79   +/-   ##
=======================================
  Coverage   99.35%   99.35%           
=======================================
  Files          47       47           
  Lines        2005     2009    +4     
=======================================
+ Hits         1992     1996    +4     
  Misses         13       13           

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