chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/deploy.yaml

@@ -17,7 +17,7 @@ jobs:
           - prettier -c .
           - astro check
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with: { token: "${{ secrets.GITHUB_TOKEN }}" }
       - uses: actions/setup-node@v6
         with:
@@ -32,7 +32,7 @@ jobs:
     needs:
       - preflight
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with: { token: "${{ secrets.GITHUB_TOKEN }}" }
       # - uses: cachix/install-nix-action@v20
       #   with: