Tests

Update API from slack-api-ref@c408935 (2025-07-03) #1728

Job	Run time
test (ruby=2.7)	39s
test (ruby=3.1)	21s
test (ruby=2.7, concurrency=async-websocket)	40s
test (ruby=jruby-head)	2m 40s
test (ruby=3.2)	22s
test (ruby=3.0)	23s
test (ruby=3.3)	27s
test (ruby=3.4)	26s
test (ruby=ruby-head)	16s
coveralls	6s
	6m 20s

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