build(deps): bump cachix/cachix-action from 15 to 16

Bumps [cachix/cachix-action](https://github.com/cachix/cachix-action) from 15 to 16.
- [Release notes](https://github.com/cachix/cachix-action/releases)
- [Commits](cachix/cachix-action@v15...v16)

---
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>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -53,13 +53,13 @@ jobs:
         upstream-cache: https://${{ matrix.cachixName }}.cachix.org
     - name: Setup pkgs.cachix.org
       if: ${{ matrix.cachixName == 'pkgs' }}
-      uses: cachix/cachix-action@v15
+      uses: cachix/cachix-action@v16
       with:
         authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
         name: ${{ matrix.cachixName }}
     - name: Setup some-unfree.cachix.org
       if: ${{ matrix.cachixName == 'some-unfree' }}
-      uses: cachix/cachix-action@v15
+      uses: cachix/cachix-action@v16
       with:
         authToken: '${{ secrets.CACHIX_AUTH_TOKEN_UNFREE }}'
         name: ${{ matrix.cachixName }}

.github/workflows/update.yml

@@ -20,7 +20,7 @@ jobs:
     - name: Show nixpkgs version
       run: nix-instantiate --eval -E '(import <nixpkgs> {}).lib.version'
     - name: Setup cachix
-      uses: cachix/cachix-action@v15
+      uses: cachix/cachix-action@v16
       with:
         authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
         name: pkgs