Restore podspec

[swhitty]

Support for Cocoapods was removed in the 0.17.0 release due to incompatibility with SE-0386 Package access modifier but there is a workaround so I can restore the podspec.

This has now been tagged and published;

--------------------------------------------------------------------------------
 🎉  Congrats

 🚀  FlyingFox (0.24.1) successfully published
 📅  July 3rd, 19:49
 🌎  https://cocoapods.org/pods/FlyingFox
 👍  Tell your friends!
--------------------------------------------------------------------------------

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.56%. Comparing base (edc1929) to head (de42987).
Report is 3 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #165      +/-   ##
==========================================
- Coverage   94.58%   94.56%   -0.03%     
==========================================
  Files          62       62              
  Lines        4119     4119              
==========================================
- Hits         3896     3895       -1     
- Misses        223      224       +1     

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