Drop Python 3.9 support

Author: madebr

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                py: [ '3.9', '3.10', '3.11', '3.12' ]
+                py: [ '3.10', '3.11', '3.12' ]
                 os: [ 'ubuntu-latest', 'windows-latest', 'macos-latest' ]
         runs-on: ${{ matrix.os }}
         steps:
@@ -32,6 +32,6 @@ jobs:
             -   uses: actions/checkout@v4
             -   uses: actions/setup-python@v5
                 with:
-                    python-version: "3.9"
+                    python-version: "3.10"
             -   run: pip install mypy
             -   run: mypy --install-types --non-interactive

setup.cfg

@@ -16,7 +16,7 @@ classifiers =
     Operating System :: OS Independent
 
 [options]
-python_requires = >=3.9
+python_requires = >=3.10
 packages=find:
 setup_requires =
     setuptools_scm