Bump E2E GDK image to Ruby 3.1
What does this MR do and why?
This is needed for qa/gdk/Dockerfile.gdk in the GitLab Rails project.
Checklist
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(If applicable) Add patches if required for upgrading Ruby version in https://gitlab.com/gitlab-org/gitlab-build-images/-/tree/master/patches/ruby.
Edited by Stan Hu