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

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

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/basic-eval.yml

@@ -15,6 +15,6 @@ jobs:
     # we don't limit this action to only NixOS repo since the checks are cheap and useful developer feedback
     steps:
     - uses: actions/checkout@v2
-    - uses: cachix/install-nix-action@v15
+    - uses: cachix/install-nix-action@v16
     # explicit list of supportedSystems is needed until aarch64-darwin becomes part of the trunk jobset
     - run: nix-build pkgs/top-level/release.nix -A tarball.nixpkgs-basic-release-checks --arg supportedSystems '[ "aarch64-darwin" "aarch64-linux" "x86_64-linux" "x86_64-darwin"  ]'

.github/workflows/editorconfig.yml

@@ -28,7 +28,7 @@ jobs:
         # pull_request_target checks out the base branch by default
         ref: refs/pull/${{ github.event.pull_request.number }}/merge
       if: env.PR_DIFF
-    - uses: cachix/install-nix-action@v15
+    - uses: cachix/install-nix-action@v16
       if: env.PR_DIFF
       with:
         # nixpkgs commit is pinned so that it doesn't break

.github/workflows/manual-nixos.yml

@@ -18,7 +18,7 @@ jobs:
         with:
           # pull_request_target checks out the base branch by default
           ref: refs/pull/${{ github.event.pull_request.number }}/merge
-      - uses: cachix/install-nix-action@v15
+      - uses: cachix/install-nix-action@v16
         with:
           # explicitly enable sandbox
           extra_nix_config: sandbox = true

.github/workflows/manual-nixpkgs.yml

@@ -18,7 +18,7 @@ jobs:
         with:
           # pull_request_target checks out the base branch by default
           ref: refs/pull/${{ github.event.pull_request.number }}/merge
-      - uses: cachix/install-nix-action@v15
+      - uses: cachix/install-nix-action@v16
         with:
           # explicitly enable sandbox
           extra_nix_config: sandbox = true

.github/workflows/nixos-manual.yml

@@ -19,7 +19,7 @@ jobs:
       with:
         # pull_request_target checks out the base branch by default
         ref: refs/pull/${{ github.event.pull_request.number }}/merge
-    - uses: cachix/install-nix-action@v15
+    - uses: cachix/install-nix-action@v16
     - name: Check DocBook files generated from Markdown are consistent
       run: |
         nixos/doc/manual/md-to-db.sh