build(deps): bump cachix/install-nix-action from 25 to 26 (#60)

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 25 to 26.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@v25...v26)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
       nix_release: ${{ steps.update.outputs.nix_release }}
       updated: ${{ steps.update.outputs.updated }}
     steps:
-      - uses: cachix/install-nix-action@v25
+      - uses: cachix/install-nix-action@v26
         with:
           nix_path: nixpkgs=channel:nixpkgs-unstable
 
@@ -57,7 +57,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: cachix/install-nix-action@v25
+      - uses: cachix/install-nix-action@v26
         with:
           install_url: ${{ github.server_url }}/${{ github.repository }}/releases/download/${{ needs.update.outputs.nix_release }}/install
           nix_path: nixpkgs=channel:nixpkgs-unstable