https: fix readable listener leak during proxy CONNECT #5842

Job	Run time
Build slim tarball	2m 12s
x86_64-darwin: with shared libraries	33m 14s
aarch64-linux: with shared libraries	18m 51s
aarch64-darwin: with shared libraries	19m 9s
x86_64-linux: with shared libraries	22m 13s
	1h 35m 39s

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