tools: make `v8.nix` more stable #4996

Job	Run time
Build slim tarball	2m 16s
aarch64-darwin: with shared libraries	1h 44m 8s
x86_64-linux: with shared libraries	1h 52m 38s
x86_64-darwin: with shared libraries	3h 42m 27s
aarch64-linux: with shared libraries	1h 20m 7s
	8h 41m 36s

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