Add support for allow_local_network_access configuration option

[abrom]

From Puppeteer v24.16.0+ (Chrome 139+) localhost network access now requires an extra permission to be granted. This PR allows Grover to control this via the allow_local_network_access configuration option (default false).

# config/initializers/grover.rb
Grover.configure do |config|
  config.allow_local_network_access = true
end

Also updates CI build matrix to remove EoL ruby/node/puppeteer versions:

• Node 18 is EoL as of 27th March 2025
• Ruby 3.1 is EoL as of 26th March 2025
• Puppeteer < 24.15.0 is no longer supported (but we'll keep 23.x in there a little while longer)