chore(deps): bump DeterminateSystems/nix-installer-action from 17 to 18

Bumps [DeterminateSystems/nix-installer-action](https://github.com/determinatesystems/nix-installer-action) from 17 to 18.
- [Release notes](https://github.com/determinatesystems/nix-installer-action/releases)
- [Commits](21a544727d...c723f3a885)

---
updated-dependencies:
- dependency-name: DeterminateSystems/nix-installer-action
  dependency-version: '18'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/flakehub-tagged.yml

@@ -20,7 +20,7 @@ jobs:
         with:
           persist-credentials: false
           ref: "${{ (inputs.tag != null) && format('refs/tags/{0}', inputs.tag) || '' }}"
-      - uses: DeterminateSystems/nix-installer-action@21a544727d0c62386e78b4befe52d19ad12692e3 # v17
+      - uses: DeterminateSystems/nix-installer-action@c723f3a885e3f1d866d91f4f0c33dd44b1fc7c60 # v18
       - uses: DeterminateSystems/flakehub-push@8da9e38b7e77f2b0a8aa08a22e57cc5c6316ea72 # v5
         with:
           visibility: "public"