fix: fallback to HTTP/2 on HTTP3 DNS error #282

Job	Run time
Linux-aarch64 with rust stable	3m 47s
Windows-aarch64 with rust stable	4m 27s
Linux-arm with rust stable	3m 43s
macOS-x86_64 with rust stable	1m 13s
macOS-aarch64 with rust stable	3m 0s
Windows-x86_64 with rust stable	2m 37s
Linux-x86_64 with rust stable	1m 50s
	20m 37s

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