fix: try to pin setup-python@v4

Author: simontaurus

.github/workflows/ci.yml

@@ -103,7 +103,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v4
         with: {python-version: "3.12"}
       - name: Retrieve pre-built distribution files
         uses: actions/download-artifact@v4