deps: update zlib to 1.3.1-5aa6173 #928

Job	Run time
Build slim tarball	1m 35s
aarch64-linux: with shared libraries	24m 22s
x86_64-linux: with shared libraries	28m 52s
aarch64-darwin: with shared libraries	24m 14s
x86_64-darwin: with shared libraries	1h 1m 31s
	2h 20m 34s

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