Check out requested release commit in prepare job

Running prepare-time file checks from the selected SHA keeps release notes and CTK inputs consistent with the commit that is actually tagged and released.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: cpcloud

.github/workflows/release-cuda-pathfinder.yml

@@ -101,6 +101,12 @@ jobs:
           echo "commit=${commit}" >> "$GITHUB_OUTPUT"
           echo "Using release commit: ${commit}"
 
+      - name: Check out release commit
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          fetch-depth: 0
+          ref: ${{ steps.commit.outputs.commit }}
+
       - name: Check release notes exist
         env:
           VERSION: ${{ steps.vars.outputs.version }}