chore(deps): bump slackapi/slack-github-action from 1.27.0 to 2.0.0 #2330

Job	Run time
create-dev-cluster	8m 21s
build-and-push / build-and-push-server	4m 58s
build-and-push / build-and-push-certifier	1m 33s
lint / actionlint	12s
lint / golint	2m 21s
lint / shellcheck	52s
unit-tests / unit-test	2m 44s
comment-on-PR	1m 3s
deploy-and-test	13m 58s
	36m 2s

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