Backport: Update gomplate version to 5.0.0

Stefan Bordeirequested to merge
cherry-pick-65c4dc3b into 9-9-stable

What does this MR do?

Backport MR to 9-9-stable because #6297 (closed)

Context: A few 18.9 CNG images inadvertently ship gomplate 5.x. This backport ensures GitLab chart 9.9 is compatible with those images.

Related issues

Workhorse template uses deprecated `slice` func... (#6297 - closed) • Clemens Beck, Stefan Bordei • 18.10

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  • Merge Request Title and Description are up to date, accurate, and descriptive.
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  • Documentation created/updated.
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  • Equivalent MR/issue for omnibus-gitlab opened.

Reviewers checklist

Edited by Clemens Beck

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