ci: use cachix/install-nix-action (#1725)

Link: https://github.com/nix-community/stylix/pull/1725

Reviewed-by: NAHO <90870942+trueNAHO@users.noreply.github.com>

.github/workflows/check.yml

@@ -34,7 +34,7 @@ jobs:
         with:
           persist-credentials: false
 
-      - uses: DeterminateSystems/nix-installer-action@v19
+      - uses: cachix/install-nix-action@v31
 
       - uses: cachix/cachix-action@v16
         with:

.github/workflows/doc.yml

@@ -28,7 +28,7 @@ jobs:
         with:
           persist-credentials: false
 
-      - uses: DeterminateSystems/nix-installer-action@v19
+      - uses: cachix/install-nix-action@v31
 
       - uses: cachix/cachix-action@v16
         with:

.github/workflows/update-flake.yml

@@ -17,7 +17,8 @@ jobs:
       - uses: actions/checkout@v4
         with:
           ref: ${{ matrix.branch }}
-      - uses: DeterminateSystems/nix-installer-action@v19
+
+      - uses: cachix/install-nix-action@v31
 
       - id: generate-token
         uses: actions/create-github-app-token@v2