Tests

Update API from slack-api-ref@3ec3c10 #1270

Job	Run time
test (ruby=2.7)	37s
test (ruby=2.7, concurrency=async-websocket)	39s
test (ruby=3.0)	32s
test (ruby=3.1)	20s
test (ruby=3.2)	18s
test (ruby=3.3)	21s
test (ruby=ruby-head)	25s
test (ruby=jruby-head)	2m 0s
coveralls	2s
	5m 14s

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