chore(deps): bump cachix/install-nix-action from 22 to 31

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 22 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@v22...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/binaries.yml

@@ -24,7 +24,7 @@ jobs:
       - uses: actions/checkout@v5
         with:
           fetch-depth: 0 # for git describe
-      - uses: cachix/install-nix-action@v22
+      - uses: cachix/install-nix-action@v31
       - run: echo "(version $(git describe --always --dirty --abbrev=7))" >> dune-project
       - run: nix build ${{ matrix.installable }}
       - uses: actions/upload-artifact@v4