docker: bump atc0005/go-ci from go-ci-unstable-build-v0.13.7 to go-ci-unstable-build-v0.13.8 in /dependabot/docker/builds #307

Job	Run time
Go Module Validation / Assert PR branch is ahead	7s
Vulnerability / Assert PR branch is ahead	7s
Lint / Assert PR branch is ahead	4s
Dependency Updates / Assert PR branch is ahead	4s
Lint / Lint Markdown files	16s
Lint / Lint Dockerfiles	8s
Dependency Updates / Look for available minor or patch releases	42s
Vulnerability / govulncheck	34s
Go Module Validation / Look for missing go.mod changes	28s
Go Module Validation / Look for missing vendored dependencies	26s
	2m 56s

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