Use yq v4 syntax

What does this MR do?

Updates call to yq to use new v4 syntax:

• https://mikefarah.gitbook.io/yq/upgrading-from-v3
• https://github.com/mikefarah/yq#notice-for-v4x-versions-prior-to-4181

Related issues

gitlab-org/build/CNG!893 (merged)

Testing

global:
  kubectl:
    image:
      tag: deps-5244820-b978f47

Deploy and confirm that you can log in, create a project, etc.

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
• Documentation created/updated
• Tests added
• Integration tests added to GitLab QA
• Equivalent MR/issue for omnibus-gitlab opened