Revert "No need to checkout the code when publishing"

This reverts commit 94a59bf.

Author: berendkleinhaneveld

.github/workflows/ci.yml

@@ -84,6 +84,7 @@ jobs:
       id-token: write
       contents: write
     steps:
+    - uses: actions/checkout@v5
     - name: Download wheel artifact
       uses: actions/download-artifact@v4
       with: