different matrix approach

.forgejo/workflows/check.yaml

@@ -37,14 +37,11 @@ jobs:
     runs-on: docker
     strategy:
       matrix:
-        python-version: [ "3.9.19", "3.10.16", "3.11.11", "3.12.9", "3.13.2" ]
+        container: [ "3.9", "3.10", "3.11", "3.12", "3.13" ]
+    container: forgejo.neshweb.net/ci-docker-images/python-neshweb:${{ matrix.container }}
     steps:
       - name: Checkout source code
         uses: actions/checkout@v4
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
       - name: Install packages
         run: |
           python --version