Tests

Update API from slack-api-ref@1ee282e (2025-04-05) #1523

Job	Run time
test (ruby=2.7)	17s
test (ruby=2.7, concurrency=async-websocket)	19s
test (ruby=3.1)	20s
test (ruby=3.0)	18s
test (ruby=3.2)	21s
test (ruby=3.4)	19s
test (ruby=jruby-head)	20s
test (ruby=3.3)	20s
test (ruby=ruby-head)	19s
coveralls	0s
	2m 53s

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