Update to Rust 1.73.0 (!742) · Merge requests · GitLab.org / gitlab-build-images · GitLab

What does this MR do and why?

https://gitlab.com/gitlab-org/ruby/gems/gitlab-glfm-markdown needs at least 1.70.0 - update to latest 1.73.0

Checklist

(If applicable) Add patches if required for upgrading Ruby version in https://gitlab.com/gitlab-org/gitlab-build-images/-/tree/master/patches/ruby.