chore(deps): update dependency nix to v2.25.4 (#165)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

renovate.Dockerfile

@@ -7,4 +7,4 @@
 FROM scratch
 
 # renovate: datasource=github-tags depName=nix packageName=NixOS/nix versioning=semver
-ENV NIX_VERSION=2.25.3
+ENV NIX_VERSION=2.25.4