GraalVM smoke tests

Improve Http2Pool connection reuse for concurrent acquires #1192

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Run time

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Job	Run time
build (macos-14, native)	5m 33s
build (ubuntu-22.04, nio)	6m 5s
build (macos-14, nio)	5m 44s
build (ubuntu-22.04, native)	6m 1s
build (ubuntu-22.04, io_uring)	5m 56s
build (windows-2022, nio)	6m 52s
	36m 11s