switch to 3.10 as min Python version (#500)

implements #482

Author: ArneBinder

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
             - name: Set up Python
               uses: actions/setup-python@v5
               with:
-                  python-version: "3.9"
+                  python-version: "3.10"
 
             - name: Upgrade pip
               run: |

.github/workflows/tests.yml

@@ -20,7 +20,7 @@ jobs:
               uses: ./.github/actions/init-env
               with:
                   os: "ubuntu-latest"
-                  python: "3.9"
+                  python: "3.10"
             - name: Compute pre-commit cache key
               id: pre-commit-cache
               shell: python
@@ -52,9 +52,9 @@ jobs:
             fail-fast: false
             matrix:
                 include:
-                    - { python: "3.9", os: "ubuntu-latest" }
-                    # - { python: "3.9", os: "macos-latest" }
-                    # - { python: "3.9", os: "windows-latest" }
+                    - { python: "3.10", os: "ubuntu-latest" }
+                    # - { python: "3.10", os: "macos-latest" }
+                    # - { python: "3.10", os: "windows-latest" }
         steps:
             - name: Check out the repository
               uses: actions/checkout@v4

poetry.lock

@@ -15,7 +15,7 @@ authors = [
 # To support automatic classifiers based on dependencies and license see https://python-poetry.org/docs/pyproject/#classifiers
 dynamic = [ "classifiers" ]
 
-requires-python = ">=3.9,<4.0"
+requires-python = ">=3.10,<4.0"
 dependencies = [
     "pie-core >=0.2.1, <0.4.0",
     "pie-documents >=0.1.0, <0.2.0",