github: bump DeterminateSystems/nix-installer-action

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


Updates `DeterminateSystems/nix-installer-action` from 12 to 13
- [Release notes](https://github.com/determinatesystems/nix-installer-action/releases)
- [Commits](DeterminateSystems/nix-installer-action@7993355...ab6bcb2)

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

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

.github/workflows/build-nix.yml

@@ -22,6 +22,6 @@ jobs:
       - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
         with:
           fetch-depth: 0
-      - uses: DeterminateSystems/nix-installer-action@7993355175c2765e5733dae74f3e0786fe0e5c4f
+      - uses: DeterminateSystems/nix-installer-action@ab6bcb2d5af0e904d04aea750e2089e9dc4cbfdd
       - uses: DeterminateSystems/magic-nix-cache-action@b46e247b898aa56e6d2d2e728dc6df6c84fdb738
       - run: nix flake check -L --show-trace