chore(deps): update cachix/install-nix-action action to v31.8.2

Author: renovate[bot]

.github/workflows/CI.yml

@@ -18,7 +18,7 @@ jobs:
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with:
           persist-credentials: false
-      - uses: cachix/install-nix-action@fd24c48048070c1be9acd18c9d369a83f0fe94d7 # v31.8.1
+      - uses: cachix/install-nix-action@456688f15bc354bef6d396e4a35f4f89d40bf2b7 # v31.8.2
       - name: Build
         run: nix-shell --pure --run 'treefmt --ci'
   build_warning_nix:
@@ -29,7 +29,7 @@ jobs:
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with:
           persist-credentials: false
-      - uses: cachix/install-nix-action@fd24c48048070c1be9acd18c9d369a83f0fe94d7 # v31.8.1
+      - uses: cachix/install-nix-action@456688f15bc354bef6d396e4a35f4f89d40bf2b7 # v31.8.2
       - name: Build
         run: nix-shell --pure --run 'make SPHINXOPTS='-W' html'
   build_docker_image_theme_tuleap_org: