build: fix python version on debian build

Author: alvarolopez

.github/workflows/packaging.yml

@@ -79,7 +79,11 @@ jobs:
       - test
       - build-sdist
     steps:
-      - name: Get cASO repo
+      - name: Set up Python 3.12
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.12
+
         uses: actions/checkout@v3
         with:
           ref: ${{ github.ref_name }}