Bump XcodeProj to 8.25.0

[Lommelun]

Describe your changes
Bump XcodeProj version to latest (8.25.0)

Testing performed
Comparing a project that is using the new buildable folders with PBXFileSystemSynchronizedBuildFileExceptionSet now without XcodeProj failing with a generic error.

Additional context
XCLocalSwiftPackageReference and PBXFileSystemSynchronizedBuildFileExceptionSet were unsupported. New XcodeProj version supports these elements.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.94%. Comparing base (c48fb45) to head (562b946).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #139      +/-   ##
==========================================
- Coverage   97.05%   96.94%   -0.11%     
==========================================
  Files          52       52              
  Lines        2986     2982       -4     
==========================================
- Hits         2898     2891       -7     
- Misses         88       91       +3     

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[kwridan]

Thank you for contributing this @Lommelun 🙏

This ensures xcdiff no longer errors when dealing with Xcode 16 projects - will spawn a separate issue to add support for diffing the new element types.