Update bundler from 2.1.4 to 2.3.22 used in CI

What does this MR do?

Updates bundler from 2.1.4 to 2.3.22 used in CI.

Counterpart MR in omnibus: gitlab-org/omnibus-gitlab!6356 (merged)

Related issues

n/a

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

Expected (please provide an explanation if not completing)

• 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
• Equivalent MR/issue for omnibus-gitlab opened