Remove remaining Python 3.9 CI actions

Author: jluethi

.github/workflows/ci_pip.yml

@@ -48,10 +48,8 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12"]
         exclude:
-          - os: macos-latest
-            python-version: '3.9'
           - os: macos-latest
             python-version: '3.10'
     name: "Tasks, Python ${{ matrix.python-version }}, ${{ matrix.os }}"

.github/workflows/ci_poetry.yml

@@ -60,7 +60,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v4

docs/development.md

@@ -36,7 +36,7 @@ poetry run pytest --ignore tests/tasks
 
 The tests files are in the `tests` folder of the repository. Its structure reflects the `fractal_tasks_core` structure, with tests for the core library in the main folder and tests for `tasks` and `dev` subpckages in their own subfolders.
 
-Tests are also run through GitHub Actions, with Python 3.9, 3.10 and 3.11. Note that within GitHub actions we run tests for both the `poetry`-installed and `pip`-installed versions of the code, which may e.g. have different versions of some dependencies (since `pip install` does not rely on the `poetry.lock` lockfile).
+Tests are also run through GitHub Actions, with Python 3.10, 3.11 and 3.12. Note that within GitHub actions we run tests for both the `poetry`-installed and `pip`-installed versions of the code, which may e.g. have different versions of some dependencies (since `pip install` does not rely on the `poetry.lock` lockfile).
 
 ## Documentation