Update README to reflect Node.js 22 and 24 directories (#66)

Updates the README to reference the current directory structure
after replacing Node.js 20 with Node.js 24.

Changes:
- Updated directory list from (20 and 22) to (22 and 24)

This keeps the documentation in sync with the actual project structure.

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

Author: chorrell

README.md

@@ -20,7 +20,7 @@ bundle exec rake
 
 The above will run Serverspec and using the docker-api gem it will
 
-- Build a Docker image from the Docker file found in the top level directories (20 and 22)
+- Build a Docker image from the Docker file found in the top level directories (22 and 24)
 - Create a container of that image,
 - Run the tests found in `spec/` on the container
 - Delete the images and containers if the test was successful