ci: bump cachix/cachix-action from 13 to 14

Bumps [cachix/cachix-action](https://github.com/cachix/cachix-action) from 13 to 14.
- [Release notes](https://github.com/cachix/cachix-action/releases)
- [Commits](cachix/cachix-action@v13...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.yaml

@@ -20,7 +20,7 @@ jobs:
       uses: nixbuild/nix-quick-install-action@v26
       with:
         nix_conf: experimental-features = nix-command flakes repl-flake
-    - uses: cachix/cachix-action@v13
+    - uses: cachix/cachix-action@v14
       with:
         name: ossystems-lab
         authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
@@ -45,7 +45,7 @@ jobs:
       uses: nixbuild/nix-quick-install-action@v26
       with:
         nix_conf: experimental-features = nix-command flakes repl-flake
-    - uses: cachix/cachix-action@v13
+    - uses: cachix/cachix-action@v14
       with:
         name: ossystems-lab
         authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}