fix: support ruby 3.4.6

[okwasniewski]

Summary:

When running ruby version:

ruby 3.4.6 (2025-09-16 revision dbd83256b1) +PRISM [arm64-darwin25]

I got this error during pod installation using bundle exec pod install

LoadError - cannot load such file -- kconv

Adding gem nkf resolved this issue.

Changelog:

[IOS] [FIXED] - Ruby 3.4.6 compatibility

Test Plan:

Run bundle exec pod install with Ruby 3.4.6 installed on the system

[artus9033]

Very good fix, it's especially important since the yet-in-beta macos-26 GH Actions runner image has Ruby 3.4.8

[artus9033]

After taking a deeper look, this looks like an upstream problem from xcodeproj:

• CFPropertyList has fixed this:
  • in version 3.0.9 for Ruby < 3.2
  • in version 4.0.0 for Ruby >= 3.2
• currently, when doing an install with Ruby < 3.2, xcodeproj==1.25.1 is resolved which brings its transitive dependency CFPropertyList==3.0.9
• unfortunately, for Ruby >= 3.2 this is not fixed, since xcodeproj constrains CFPropertyList to be >= 2.3.3, < 4.0 therefore CFPropertyList versions >= 4.0.0 (which have the fix for Ruby >= 3.2) will not be considered

Alternatively, contributing to xcodeproj to depend on CFPropertyList that is not constrained to be < 4.0 should resolve the issue.