Revert to go 1.15
What does this MR do?
The recent update to go 1.16 broke our integration tests. This MR reverts the change so development does not get blocked.
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
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Changelog entry added -
Documentation created/updated for GitLab EE, if necessary -
Documentation created/updated for this project, if necessary -
Documentation reviewed by technical writer or follow-up review issue created -
Tests added for this feature/bug -
Job definition updated, if necessary -
Conforms to the code review guidelines -
Conforms to the Go guidelines -
Security reports checked/validated by reviewer