Remove upstream patch for RHEL 5 and Ruby 2.1/2.2 from ruby

What does this MR do?

Removes the patch for RHEL 5 and Ruby 2.1/2.2 adapted from the upstream from ruby software.

The upstream removed it in 2018 in https://github.com/chef/omnibus-software/pull/965.

Related issues

Relates to !6246 (merged)

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

Required

• Merge Request Title, and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com
• [n/a] Pipeline is green on dev.gitlab.org if the change is touching anything besides documentation or internal cookbooks
• trigger-package has a green pipeline running against latest commit

Expected (please provide an explanation if not completing)

• [n/a] Test plan indicating conditions for success has been posted and passes
• [n/a] Documentation created/updated
• [n/a] Tests added
• [n/a] Integration tests added to GitLab QA
• [n/a] Equivalent MR/issue for the GitLab Chart opened