Add gomplate to deps.yml

What does this MR do?

Add gomplate to deps.yml

Automate gomplate updates via dependencies.io.

Related issues

Relates #347 (closed)

Test Plan

Run deps upgrade -v locally and verify all gomplate version references are updated.

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
• When ready for review, MR is labeled "~workflow::ready for review" per the Distribution MR workflow

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Integration tests added to GitLab QA
• The impact any change in container size has should be evaluated