Fix release job (#9)

Author: AttilaGombosER

.github/workflows/test_and_release.yml

@@ -46,6 +46,8 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
       - name: Package and publish
         uses: EffectiveRange/python-package-github-action@v2
         with: