chore(deps): bump slackapi/slack-github-action from 1.25.0 to 1.26.0 … #322

Job	Run time
lint / golint	1m 41s
build-and-push / build-and-push-certifier	1m 42s
build-and-push / build-and-push-server	5m 27s
lint / actionlint	4s
lint / shellcheck	1m 7s
unit-tests / unit-test	3m 4s
	13m 5s

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