Fix `nix upgrade-nix` profile search #13629

Job	Run time
Check Cachix and Docker secrets present for installer tests	1s
vm_tests	12m 3s
eval	56s
tests (ubuntu-latest)	20m 59s
tests (macos-latest)	12m 36s
flake_regressions	12m 24s
docker_push_image	0s
installer	0s
installer_test	0s
	58m 59s

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