Update cachix/install-nix-action digest to 8aa0397

Author: renovate[bot]

.github/workflows/lint.yaml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-      - uses: cachix/install-nix-action@ab739621df7a23f52766f9ccc97f38da6b7af14f # v31
+      - uses: cachix/install-nix-action@8aa03977d8d733052d78f4e008a241fd1dbf36b3 # v31
         with:
           nix_path: nixpkgs=channel:nixos-unstable