Tests

Update API from slack-api-ref@1ee282e (2025-04-08) #1535

Job	Run time
test (ruby=2.7, concurrency=async-websocket)	43s
test (ruby=2.7)	33s
test (ruby=3.2)	22s
test (ruby=3.3)	23s
test (ruby=3.1)	25s
test (ruby=ruby-head)	25s
test (ruby=jruby-head)	2m 51s
test (ruby=3.0)	23s
test (ruby=3.4)	25s
coveralls	5s
	6m 35s

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