Tests

Update API from slack-api-ref@c408935 (2025-06-06) #1664

Job	Run time
test (ruby=2.7, concurrency=async-websocket)	37s
test (ruby=2.7)	38s
test (ruby=3.1)	21s
test (ruby=3.3)	24s
test (ruby=3.0)	24s
test (ruby=jruby-head)	2m 43s
test (ruby=ruby-head)	17s
test (ruby=3.2)	26s
test (ruby=3.4)	26s
coveralls	3s
	6m 19s

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