meta: bump cachix/cachix-action #2994

Job	Run time
Build slim tarball	1m 44s
aarch64-linux: with shared libraries	1h 28m 40s
aarch64-darwin: with shared libraries	3h 23m 57s
x86_64-linux: with shared libraries	2h 5m 13s
x86_64-darwin: with shared libraries	59m 19s
	7h 58m 53s

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