chore(deps): update cachix/install-nix-action digest to 5261181

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-    - uses: cachix/install-nix-action@d1ca217b388ee87b2507a9a93bf01368bde7cec2 # v31
+    - uses: cachix/install-nix-action@526118121621777ccd86f79b04685a9319637641 # v31
     - uses: cachix/cachix-action@0fc020193b5a1fa3ac4575aa3a7d3aa6a35435ad # v16
       with:
         name: devenv