Chore: update Gemfile.lock

[angela-tran]

After merging in #258, the devcontainer tells me I need to run bundle install which results in these Gemfile.lock changes.

• Executing task: bundle exec jekyll serve --force_polling --livereload

Could not find ffi-1.17.1-x86_64-linux in locally installed gems
Run bundle install to install missing gems.

• The terminal process "/bin/bash '-c', 'bundle exec jekyll serve --force_polling --livereload'" failed to launch (exit code: 7).
• Terminal will be reused by tasks, press any key to close it.

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