ci: bump DeterminateSystems/nix-installer-action from 14 to 16

Bumps [DeterminateSystems/nix-installer-action](https://github.com/determinatesystems/nix-installer-action) from 14 to 16.
- [Release notes](https://github.com/determinatesystems/nix-installer-action/releases)
- [Commits](DeterminateSystems/nix-installer-action@v14...v16)

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

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

Author: dependabot[bot]

.github/workflows/publish.yml

@@ -33,7 +33,7 @@ jobs:
         with:
           submodules: recursive
       - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v14
+        uses: DeterminateSystems/nix-installer-action@v16
       - name: Run the Magic Nix Cache
         uses: DeterminateSystems/magic-nix-cache-action@v8
       - name: Build with Nix

.github/workflows/update-flake-lock.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v14
+        uses: DeterminateSystems/nix-installer-action@v16
       - name: Run the Magic Nix Cache
         uses: DeterminateSystems/magic-nix-cache-action@v8
       - name: Check flake health