http2: fix zombie session crash on socket close #3081

Job	Run time
Build slim tarball	1m 19s
x86_64-darwin: with shared libraries	1h 1m 36s
aarch64-linux: with shared libraries	39m 11s
aarch64-darwin: with shared libraries	55m 57s
x86_64-linux: with shared libraries	1h 0m 2s
	3h 38m 5s

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