Build Image: Bump atc0005/go-ci from go-ci-unstable-build-v0.21.5 to go-ci-unstable-build-v0.21.6 in /dependabot/docker/builds #561

Job	Run time
Go Module Validation / Assert PR branch is ahead	4s
Dependency Updates / Assert PR branch is ahead	4s
Lint / Assert PR branch is ahead	3s
Vulnerability / Assert PR branch is ahead	4s
Lint / Lint Dockerfiles	7s
Lint / Lint Markdown files	7s
Vulnerability / govulncheck	21s
Go Module Validation / Look for missing vendored dependencies	17s
Go Module Validation / Look for missing go.mod changes	14s
Dependency Updates / Look for available minor or patch releases	22s
	1m 43s

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