Tests

Preparing for release, 2.5.2. #1425

Job	Run time
test (ruby=2.7)	32s
test (ruby=2.7, concurrency=async-websocket)	37s
test (ruby=3.0)	18s
test (ruby=3.1)	24s
test (ruby=3.2)	24s
test (ruby=3.3)	27s
test (ruby=3.4)	20s
test (ruby=ruby-head)	21s
test (ruby=jruby-head)	1m 52s
coveralls	2s
	5m 17s

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