Tests

Added support for Ruby 3.4. #1408

Job	Run time
test (ruby=2.7)	36s
test (ruby=2.7, concurrency=async-websocket)	44s
test (ruby=3.0)	18s
test (ruby=3.1)	28s
test (ruby=3.2)	26s
test (ruby=3.3)	20s
test (ruby=3.4)	20s
test (ruby=ruby-head)	25s
test (ruby=jruby-head)	1m 52s
coveralls	2s
	5m 31s

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