build(deps): bump cachix/cachix-action from 14 to 15

Bumps [cachix/cachix-action](https://github.com/cachix/cachix-action) from 14 to 15.
- [Release notes](https://github.com/cachix/cachix-action/releases)
- [Commits](cachix/cachix-action@v14...v15)

---
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/lint.yml

@@ -21,7 +21,7 @@ jobs:
       with:
         extra_nix_config: |
           access-tokens = github.com=${{ github.token }}
-    - uses: cachix/cachix-action@v14
+    - uses: cachix/cachix-action@v15
       with:
         name: enarx
         authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
@@ -36,7 +36,7 @@ jobs:
       with:
         extra_nix_config: |
           access-tokens = github.com=${{ github.token }}
-    - uses: cachix/cachix-action@v14
+    - uses: cachix/cachix-action@v15
       with:
         name: enarx
         authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'

.github/workflows/release.yml

@@ -46,7 +46,7 @@ jobs:
       with:
         extra_nix_config: |
           access-tokens = github.com=${{ github.token }}
-    - uses: cachix/cachix-action@v14
+    - uses: cachix/cachix-action@v15
       with:
         name: enarx
         authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'