Merge pull request #475 from cloudfoundry/dependabot/docker/dockerfil… #690

Job	Run time
lint (.)	37s
test (.)	33s
lint (tasks/lookup-slack-channel-for-release-owner)	2m 31s
test (tasks/lookup-slack-channel-for-release-owner)	17s
lint (util/update-manifest-releases)	50s
test (util/update-manifest-releases)	45s
lint (util/cat-search-tool)	24s
test (util/cat-search-tool)	21s
lint (ci/resources/stemcell-version-bump)	1m 27s
test (ci/resources/stemcell-version-bump)	58s
	8m 43s

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