build(deps): bump DeterminateSystems/nix-installer-action from 12 to 13

Bumps [DeterminateSystems/nix-installer-action](https://github.com/determinatesystems/nix-installer-action) from 12 to 13.
- [Release notes](https://github.com/determinatesystems/nix-installer-action/releases)
- [Commits](DeterminateSystems/nix-installer-action@v12...v13)

---
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>

.github/workflows/flake-checker.yml

@@ -16,6 +16,6 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - uses: DeterminateSystems/nix-installer-action@v12
+      - uses: DeterminateSystems/nix-installer-action@v13
       - uses: DeterminateSystems/magic-nix-cache-action@v7
       - uses: DeterminateSystems/flake-checker-action@v8

.github/workflows/flake-updater.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - uses: DeterminateSystems/nix-installer-action@v12
+      - uses: DeterminateSystems/nix-installer-action@v13
       - uses: DeterminateSystems/magic-nix-cache-action@v7
       - uses: DeterminateSystems/update-flake-lock@v23
         with: