The Ruby version was updated to 4.0.1 in .ruby-version, but the CI configuration and dependency lock file were not updated accordingly. The documentation.yml workflow is missing a ruby/setup-ruby action, which means the GitHub Actions runner will use an older, pre-installed Ruby version instead of 4.0.1. Furthermore, the Gemfile.lock file was not regenerated for Ruby 4.0.1 and still contains dependencies locked for Ruby 3.2.2. The combination of an incorrect Ruby runtime in CI and an outdated lock file will cause the bundle install step to fail, blocking documentation deployments.

First, add the ruby/setup-ruby action to the documentation.yml workflow to ensure it uses Ruby 4.0.1. Then, regenerate the lock file by running bundle update --bundler and bundle lock to ensure all dependencies are compatible with Ruby 4.0.1. Commit the updated Gemfile.lock.