Tests

Preparing for release, 2.5.1. #1415

Job	Run time
test (ruby=2.7)	35s
test (ruby=2.7, concurrency=async-websocket)	33s
test (ruby=3.0)	19s
test (ruby=3.1)	20s
test (ruby=3.2)	21s
test (ruby=3.3)	20s
test (ruby=3.4)	22s
test (ruby=ruby-head)	22s
test (ruby=jruby-head)	1m 53s
coveralls	2s
	5m 7s

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