github: bump install-nix-action

.github/workflows/cachix.yaml

@@ -5,14 +5,15 @@ on:
       - 'pkgs/**'
       - 'flake.nix'
       - 'flake.lock'
+      - '.github/workflows/*'
 jobs:
   build:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - uses: cachix/install-nix-action@v13
+    - uses: cachix/install-nix-action@v14
       with:
-        install_url: https://nixos-nix-install-tests.cachix.org/serve/i6laym9jw3wg9mw6ncyrk6gjx4l34vvx/install
+        install_url: https://nixos-nix-install-tests.cachix.org/serve/vij683ly7sl95nnhb67bdjjfabclr85m/install
         install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'
         extra_nix_config: |
           experimental-features = nix-command flakes

.github/workflows/nur-update.yaml

@@ -4,6 +4,7 @@ on:
       - 'main'
     paths:
       - 'pkgs/**'
+      - '.github/workflows/*'
 
 jobs:
   update-nur: