chore(deps): update cachix/install-nix-action digest to 51f3067

Author: renovate[bot]

.github/workflows/build.yml

@@ -24,7 +24,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v6
-      - uses: cachix/install-nix-action@1ca7d21a94afc7c957383a2d217460d980de4934 # v31
+      - uses: cachix/install-nix-action@51f3067b56fe8ae331890c77d4e454f6d60615ff # v31
       - uses: cachix/cachix-action@v17
         with:
           name: nixpkgs-python

.github/workflows/update.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Free Disk Space (Ubuntu)
         uses: jlumbroso/free-disk-space@main
       - name: Install Nix
-        uses: cachix/install-nix-action@1ca7d21a94afc7c957383a2d217460d980de4934 # v31
+        uses: cachix/install-nix-action@51f3067b56fe8ae331890c77d4e454f6d60615ff # v31
       - name: Install Cachix
         uses: cachix/cachix-action@v17
         with: