Update registry.gitlab.com/gitlab-org/ci-cd/runner-tools/base-images/ubi-go Docker tag to v0.0.21 (master)

This MR contains the following updates:

Package	Type	Update	Change
registry.gitlab.com/gitlab-org/ci-cd/runner-tools/base-images/ubi-go	stage	patch	0.0.18 -> 0.0.21

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