fix: Add nkf and base64 to Gemfile for Ruby 3.4 compatibility

[kimchi-developer]

Ruby 3.4 removed 'kconv' (which requires 'nkf') and 'base64' from the standard library. This commit adds them to the Gemfiles to fix 'pod install' failures on Ruby 3.4 environments.

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[meta-codesync]

@cipolleschi has imported this pull request. If you are a Meta employee, you can view this in D92147798.

[cortinico]

Review automatically exported from Phabricator review in Meta.

[meta-codesync]

@cipolleschi merged this pull request in 51c9658.

[react-native-bot]

This pull request was successfully merged by @kimchi-developer in 51c9658

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