Bump cachix/install-nix-action from 20 to 23

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 20 to 23.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@v20...v23)

---
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]>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -54,7 +54,7 @@ jobs:
         pip install .
     - name: Set up nix
       if: matrix.type == 'dapp'
-      uses: cachix/install-nix-action@v20
+      uses: cachix/install-nix-action@v23
     - name: Set up cachix
       if: matrix.type == 'dapp'
       uses: cachix/cachix-action@v12