build(deps): bump cachix/install-nix-action from 26 to 31

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 26 to 31.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Changelog](https://github.com/cachix/install-nix-action/blob/master/RELEASE.md)
- [Commits](cachix/install-nix-action@v26...v31)

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
  dependency-version: '31'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/cargo-build.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@v31
       - uses: DeterminateSystems/magic-nix-cache-action@main
 
       - uses: nicknovitski/nix-develop@v1