Update pipeline.yml

Author: jan-janssen

.github/workflows/pipeline.yml

@@ -83,7 +83,7 @@ jobs:
     strategy:
       matrix:
         operating-system: [ubuntu-latest, macos-latest]
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13', '3.14']
+        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
     steps:
     - uses: actions/checkout@v4
     - name: Conda config
@@ -153,4 +153,4 @@ jobs:
         run: |
           cp -r docs/images .
           papermill docs/technology.ipynb docs/technology-out.ipynb -k python3
-          papermill docs/implementation.ipynb docs/implementation-out.ipynb -k python3
+          papermill docs/implementation.ipynb docs/implementation-out.ipynb -k python3