Tests

Update API from slack-api-ref@c408935 #1705

Job	Run time
test (ruby=2.7, concurrency=async-websocket)	8s
test (ruby=3.1)	20s
test (ruby=3.3)	10s
test (ruby=2.7)	10s
test (ruby=3.2)	19s
test (ruby=3.4)	19s
test (ruby=ruby-head)	8s
test (ruby=3.0)	7s
test (ruby=jruby-head)	10s
coveralls	0s
	1m 51s

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