COMPAT: h3 v4 compatibility #2838

Job	Run time
ubuntu-latest, ci/310-oldest.yaml	3m 43s
ubuntu-latest, ci/310-oldest.yaml	3m 31s
ubuntu-latest, ci/310-latest.yaml	3m 3s
ubuntu-latest, ci/310-latest.yaml	3m 21s
ubuntu-latest, ci/311-latest.yaml	3m 24s
ubuntu-latest, ci/311-latest.yaml	3m 31s
ubuntu-latest, ci/312-min.yaml	4m 10s
ubuntu-latest, ci/312-min.yaml	4m 39s
ubuntu-latest, ci/312-latest.yaml	3m 15s
ubuntu-latest, ci/312-latest.yaml	3m 36s
ubuntu-latest, ci/312-dev.yaml	3m 53s
ubuntu-latest, ci/312-dev.yaml	3m 50s
macos-13, ci/312-latest.yaml	7m 3s
macos-13, ci/312-latest.yaml	5m 44s
macos-14, ci/312-latest.yaml	2m 30s
macos-14, ci/312-latest.yaml	3m 5s
windows-latest, ci/312-latest.yaml	4m 12s
windows-latest, ci/312-latest.yaml	3m 14s
	1h 9m 44s

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