Tests

Update API from slack-api-ref@1ee282e (2025-04-06) #1528

Job	Run time
test (ruby=2.7)	34s
test (ruby=2.7, concurrency=async-websocket)	34s
test (ruby=3.0)	20s
test (ruby=ruby-head)	21s
test (ruby=3.2)	23s
test (ruby=3.1)	21s
test (ruby=3.4)	21s
test (ruby=3.3)	22s
test (ruby=jruby-head)	2m 39s
coveralls	5s
	6m 0s

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