build(deps): bump DeterminateSystems/update-flake-lock from 15 to 16

Bumps [DeterminateSystems/update-flake-lock](https://github.com/DeterminateSystems/update-flake-lock) from 15 to 16.
- [Release notes](https://github.com/DeterminateSystems/update-flake-lock/releases)
- [Commits](https://github.com/DeterminateSystems/update-flake-lock/compare/v15...v16)

---
updated-dependencies:
- dependency-name: DeterminateSystems/update-flake-lock
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/flake-updates-nixpkgs-update.yml

@@ -14,6 +14,6 @@ jobs:
             experimental-features = nix-command flakes
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
       - name: Update flake.lock
-        uses: DeterminateSystems/update-flake-lock@v15
+        uses: DeterminateSystems/update-flake-lock@v16
         with:
           inputs: nixpkgs-update

.github/workflows/flake-updates.yml

@@ -16,4 +16,4 @@ jobs:
             experimental-features = nix-command flakes
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
       - name: Update flake.lock
-        uses: DeterminateSystems/update-flake-lock@v15
+        uses: DeterminateSystems/update-flake-lock@v16