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/ci.yml

@@ -23,7 +23,7 @@ jobs:
           extra_nix_config: |
             max-jobs = 4
       - name: Setup cachix
-        uses: cachix/cachix-action@v15
+        uses: cachix/cachix-action@v16
         with:
           name: homotopy-io
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
@@ -47,7 +47,7 @@ jobs:
           extra_nix_config: |
             max-jobs = 4
       - name: Setup cachix
-        uses: cachix/cachix-action@v15
+        uses: cachix/cachix-action@v16
         with:
           name: homotopy-io
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
@@ -65,7 +65,7 @@ jobs:
           extra_nix_config: |
             max-jobs = 4
       - name: Setup cachix
-        uses: cachix/cachix-action@v15
+        uses: cachix/cachix-action@v16
         with:
           name: homotopy-io
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
@@ -92,7 +92,7 @@ jobs:
           extra_nix_config: |
             max-jobs = 4
       - name: Setup cachix
-        uses: cachix/cachix-action@v15
+        uses: cachix/cachix-action@v16
         with:
           name: homotopy-io
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
@@ -147,7 +147,7 @@ jobs:
           extra_nix_config: |
             max-jobs = 4
       - name: Setup cachix
-        uses: cachix/cachix-action@v15
+        uses: cachix/cachix-action@v16
         with:
           name: homotopy-io
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'

.github/workflows/nix.yml

@@ -38,7 +38,7 @@ jobs:
           extra_nix_config: |
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
       - name: Setup cachix
-        uses: cachix/cachix-action@v15
+        uses: cachix/cachix-action@v16
         with:
           name: homotopy-io
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'