Update site-publishing deps for 2024
The current Gemfile.lock has issues on newer Ruby/Bundler versions. Add a missing 'json' Gem (required for nanoc to work on Ruby 3.x) and update the lockfile with the current versions of everything.
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The current Gemfile.lock has issues on newer Ruby/Bundler versions. Add a missing 'json' Gem (required for nanoc to work on Ruby 3.x) and update the lockfile with the current versions of everything.