http2: fix zombie session crash on socket close #3175

Job	Run time
Build slim tarball	1m 32s
aarch64-linux: with shared libraries	28m 58s
x86_64-linux: with shared libraries	34m 49s
x86_64-darwin: with shared libraries	1h 9m 21s
aarch64-darwin: with shared libraries	1h 19m 7s
	3h 33m 47s

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