build(deps): bump DeterminateSystems/nix-installer-action

Bumps the actions group with 1 update in the / directory: [DeterminateSystems/nix-installer-action](https://github.com/determinatesystems/nix-installer-action).


Updates `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
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/flake_update.yml

@@ -18,7 +18,7 @@ jobs:
         with:
           submodules: true
       - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v14
+        uses: DeterminateSystems/nix-installer-action@v16
       - name: Update flake.lock
         uses: DeterminateSystems/update-flake-lock@v24
         with: