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] <[email protected]>

.github/workflows/check.yml

@@ -14,7 +14,7 @@ jobs:
       with:
         github_access_token: ${{ secrets.GITHUB_TOKEN }}
     - name: Setup cachix
-      uses: cachix/cachix-action@v14
+      uses: cachix/cachix-action@v15
       with:
         name: nixos-cn
         signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'