Tests

Update API from slack-api-ref@1ee282e (2025-03-03) #1457

Job	Run time
test (ruby=2.7)	34s
test (ruby=2.7, concurrency=async-websocket)	32s
test (ruby=3.0)	18s
test (ruby=3.1)	20s
test (ruby=3.2)	21s
test (ruby=3.3)	21s
test (ruby=3.4)	19s
test (ruby=ruby-head)	25s
test (ruby=jruby-head)	1m 58s
coveralls	4s
	5m 12s

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