Tests

Update API from slack-api-ref@c408935 (2025-06-03) #1658

Job	Run time
test (ruby=2.7, concurrency=async-websocket)	43s
test (ruby=3.3)	31s
test (ruby=3.2)	22s
test (ruby=3.0)	22s
test (ruby=3.4)	28s
test (ruby=ruby-head)	40s
test (ruby=3.1)	25s
test (ruby=2.7)	37s
test (ruby=jruby-head)	2m 45s
coveralls	4s
	6m 57s

Provide feedback