Update project dependencies (CocoaPods, etc.)

[schuyler]

Pull Request

Based on PR #1325 from MacDownApp/macdown by @lucy-jane
MacDownApp/macdown#1325

Description

Update project dependencies using dependabot. The original PR notes that it builds fine but may require Xcode modifications to add libarclite files as they are now deprecated.

Benefits

• Keep dependencies up-to-date with security patches
• Maintain compatibility with modern development tools
• Reduce technical debt
• Address deprecation warnings

Implementation Notes

• Review the specific dependency updates from the PR
• Test build on current Xcode version
• Address any deprecated library issues (libarclite)
• Run full test suite to verify no regressions
• Consider using Bundler for CocoaPods management (already in place)
• May need to update Podfile.lock

Considerations

• Some dependencies may have breaking changes
• Need to verify compatibility with macOS 10.14+ target
• May require code changes for deprecated APIs

Priority

MEDIUM - Technical debt and maintenance

Labels

dependencies, maintenance

[schuyler]

Closing as duplicate of #190 (Dependency Upgrade Roadmap and Strategy), which provides a comprehensive, structured plan for all dependency work. Individual dependencies are now tracked via specific issues: #72, #129, #133, #134, #137, #138, #187, #188, #189.