chore(deps): update cachix/install-nix-action action to v29 (#70)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -10,5 +10,5 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
-    - uses: cachix/install-nix-action@ba0dd844c9180cbf77aa72a116d6fbc515d0e87b # v27
+    - uses: cachix/install-nix-action@9f70348d77d0422624097c4b7a75563948901306 # v29
     - run: ./ci.sh