ci: update actions/checkout to v7.0.1

SHA-pinned actions/checkout v6.0.2 (de0fac2e) -> v7.0.1 (3d3c42e5).

Author: daviduhden

.github/workflows/archive.yml

@@ -20,7 +20,7 @@ jobs:
       # Checkout repository (full history + LFS)
       # ----------------------------
       - name: Checkout repository
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7
         with:
           lfs: true
           fetch-depth: 0