github actions: Restore minimal shallow cloning of patchutils repo

This was lost in a previous commit. Bring it back so we don't needlessly
clone the entire patchutils repo and history.

Author: kerneltoast

.github/workflows/validate-kernel-commits.yml

@@ -191,14 +191,10 @@ jobs:
           # Security: Pin to specific commit to prevent supply chain attacks
           EXPECTED_COMMIT="60a60b3909d0e29c0ff286f6a73de4168977b097"
 
-          # Clone repository
-          git clone https://github.com/kerneltoast/patchutils.git
+          # Clone repository at the specific commit we want
+          git clone https://github.com/kerneltoast/patchutils.git --depth=1 --revision="$EXPECTED_COMMIT"
           cd patchutils
 
-          # Fetch the specific commit we want
-          git fetch origin "$EXPECTED_COMMIT"
-          git checkout "$EXPECTED_COMMIT"
-
           # Verify we're on the expected commit
           ACTUAL_COMMIT=$(git rev-parse HEAD)
           if [ "$ACTUAL_COMMIT" != "$EXPECTED_COMMIT" ]; then