Fix plist date parsing

[trevor-e]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 30.76923% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.48%. Comparing base (fabe8d8) to head (15f3a86).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/launchpad/size/analyzers/apple.py	30.76%	7 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #476      +/-   ##
==========================================
- Coverage   80.53%   80.48%   -0.05%     
==========================================
  Files         161      161              
  Lines       13672    13680       +8     
  Branches     1451     1452       +1     
==========================================
  Hits        11011    11011              
- Misses       2117     2124       +7     
- Partials      544      545       +1     

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