Tests

Bump actions/checkout from 4 to 5 #1771

Job	Run time
test (ruby=3.1)	47s
test (ruby=3.0)	44s
test (ruby=3.4)	48s
test (ruby=2.7, concurrency=async-websocket)	1m 7s
test (ruby=2.7)	1m 7s
test (ruby=3.3)	46s
test (ruby=ruby-head)	37s
test (ruby=jruby-head)	3m 4s
test (ruby=3.2)	31s
coveralls	6s
	9m 37s

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