Tests

Update API from slack-api-ref@3ec3c10 #1314

Job	Run time
test (ruby=2.7)	31s
test (ruby=2.7, concurrency=async-websocket)	31s
test (ruby=3.0)	18s
test (ruby=3.1)	19s
test (ruby=3.2)	18s
test (ruby=3.3)	19s
test (ruby=ruby-head)	22s
test (ruby=jruby-head)	1m 55s
coveralls	4s
	4m 37s

Provide feedback