Build Image: Bump atc0005/go-ci from go-ci-oldstable-build-v0.21.13 to go-ci-oldstable-build-v0.21.15 in /dependabot/docker/builds #450

Job	Run time
Vulnerability / Assert PR branch is ahead	8s
Dependency Updates / Assert PR branch is ahead	5s
Go Module Validation / Assert PR branch is ahead	4s
Lint / Assert PR branch is ahead	3s
Lint / Lint Dockerfiles	9s
Lint / Lint Markdown files	7s
Go Module Validation / Look for missing go.mod changes	17s
Go Module Validation / Look for missing vendored dependencies	16s
Dependency Updates / Look for available minor or patch releases	17s
Vulnerability / govulncheck	18s
	1m 44s

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