meta: bump cachix/install-nix-action from 31.10.5 to 31.10.6 #7665

Job	Run time
Build slim tarball	1m 12s
aarch64-linux: Cache V8 build	23s
aarch64-darwin: with shared libraries	22m 58s
x86_64-darwin: with shared libraries	41m 15s
x86_64-linux: with shared libraries	25m 9s
aarch64-linux: with shared openssl-3.0.20	23m 45s
aarch64-linux: with shared openssl-1.1.1w	22m 47s
aarch64-linux: with shared boringssl-0.20260508.0	23m 51s
aarch64-linux: with shared openssl-3.6.2	24m 14s
aarch64-linux: with shared openssl-3.5.6	24m 9s
aarch64-linux: with shared openssl-4.0.0	23m 49s
	3h 53m 32s

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