chore(deps): bump cachix/install-nix-action from 13 to 14

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 13 to 14.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](https://github.com/cachix/install-nix-action/compare/v13...v14)

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/test.yml

@@ -17,7 +17,7 @@ jobs:
     - run: yarn build
     # check if typescript generation was committed
     - run: git diff --exit-code
-    - uses: cachix/install-nix-action@v13
+    - uses: cachix/install-nix-action@v14
     - name: Test public cache
       uses: ./
       with:
@@ -34,7 +34,7 @@ jobs:
     - uses: actions/checkout@v2.3.4
     - run: yarn install --frozen-lockfile
     - run: yarn build
-    - uses: cachix/install-nix-action@v13
+    - uses: cachix/install-nix-action@v14
     - name: Test public cache no signing key
       uses: ./
       with:
@@ -51,7 +51,7 @@ jobs:
     - uses: actions/checkout@v2.3.4
     - run: yarn install --frozen-lockfile
     - run: yarn build
-    - uses: cachix/install-nix-action@v13
+    - uses: cachix/install-nix-action@v14
     - name: Test private cache
       uses: ./
       with:
@@ -69,7 +69,7 @@ jobs:
     - uses: actions/checkout@v2.3.4
     - run: yarn install --frozen-lockfile
     - run: yarn build
-    - uses: cachix/install-nix-action@v13
+    - uses: cachix/install-nix-action@v14
     - name: Test private cache
       uses: ./
       with:
@@ -86,7 +86,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Install Nix
-      uses: cachix/install-nix-action@v13
+      uses: cachix/install-nix-action@v14
       with: 
         nix_path: nixpkgs=channel:nixos-21.05
         install_url: https://nixos-nix-install-tests.cachix.org/serve/i6laym9jw3wg9mw6ncyrk6gjx4l34vvx/install