Drop Swift 5.10

[fpseverino]

• Update to Swift 6
• Update tests to Swift Testing

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.80%. Comparing base (49e6ec8) to head (9cc57be).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
- Coverage   97.03%   96.80%   -0.23%     
==========================================
  Files           8        8              
  Lines         405      376      -29     
==========================================
- Hits          393      364      -29     
  Misses         12       12              

Files with missing lines	Coverage Δ
Sources/Zip/Date+dosDate.swift	100.00% <ø> (ø)
Sources/Zip/QuickZip.swift	100.00% <100.00%> (ø)
Sources/Zip/URL+nativePath.swift	100.00% <100.00%> (ø)
Sources/Zip/Zip.swift	94.80% <100.00%> (-0.51%)	⬇️
Sources/Zip/ZipCompression.swift	100.00% <100.00%> (ø)
Sources/Zip/ZipError.swift	100.00% <ø> (ø)

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