Bump cachix/cachix-action from 12 to 14

Bumps [cachix/cachix-action](https://github.com/cachix/cachix-action) from 12 to 14.
- [Release notes](https://github.com/cachix/cachix-action/releases)
- [Commits](cachix/cachix-action@v12...v14)

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

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

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
 
       - name: Setup Nix caches
-        uses: cachix/cachix-action@v12
+        uses: cachix/cachix-action@v14
         with:
           name: tweag-cooked-validators
           ## This auth token will give write access to the cache, meaning that
@@ -59,7 +59,7 @@ jobs:
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
 
       - name: Setup Nix caches
-        uses: cachix/cachix-action@v12
+        uses: cachix/cachix-action@v14
         with:
           name: tweag-cooked-validators
           ## This auth token will give write access to the cache, meaning that
@@ -91,7 +91,7 @@ jobs:
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
 
       - name: Setup Nix caches
-        uses: cachix/cachix-action@v12
+        uses: cachix/cachix-action@v14
         with:
           name: tweag-cooked-validators
           ## No auth token: read only cache.
@@ -218,7 +218,7 @@ jobs:
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
 
       - name: Setup Nix caches
-        uses: cachix/cachix-action@v12
+        uses: cachix/cachix-action@v14
         with:
           name: tweag-cooked-validators
           ## No auth token: read only cache.
@@ -284,7 +284,7 @@ jobs:
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
 
       - name: Setup Nix caches
-        uses: cachix/cachix-action@v12
+        uses: cachix/cachix-action@v14
         with:
           name: tweag-cooked-validators
           ## This auth token will give write access to the cache, meaning that