tools: fix update-icu script #490

Job	Run time
Build slim tarball	1m 30s
aarch64-darwin: with shared libraries	31m 51s
x86_64-darwin: with shared libraries	35m 8s
x86_64-linux: with shared libraries	32m 15s
aarch64-linux: with shared libraries	25m 53s
	2h 6m 37s

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