Regenerate Gemfile.lock as universal lockfile

Run tests on Ruby 4.0 on CI

Drop support for Ruby 3.1

Upgrade nokogiri to address vulnerability

Upgrade rack to address multiple vulnerabilities

Update Sinatra to fix vulnerability

Upgrade rack to address multiple vulnerabilities

Upgrade nokogiri to fix vulnerabilities

Update rack to fix vulnerability

Update rack-session to vulnerability

Update rack to vulnerability

Upgrade nokogiri to fix vulnerabilities

Upgrade nokogiri to fix vulnerabilities

Update Rack to fix vulnerability

Update Rack to fix vulnerability