MNT: Bump to minimum Python 3.9

Author: kernc

.github/actions/setup/action.yml

@@ -8,7 +8,7 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - name: Set up Python ${{ matrix.python-version }}
+    - name: Set up Python ${{ inputs.python-version }}
       uses: actions/setup-python@v5
       with:
         python-version: ${{ inputs.python-version }}

.github/workflows/ci.yml

@@ -7,11 +7,14 @@ on:
 jobs:
   test-matrix:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.9', '>=3']
     steps:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/setup
         with:
-          python-version: '>=3'
+          python-version: ${{ matrix.python-version }}
 
       - run: pip install -U pip setuptools wheel && pip install -U .
       - run: time python -m unittest -v pdoc.test

setup.py

@@ -2,8 +2,8 @@
 import sys
 from setuptools import setup, find_packages
 
-if sys.version_info < (3, 7):
-    sys.exit('ERROR: pdoc requires Python 3.7+')
+if sys.version_info < (3, 9):
+    sys.exit('ERROR: pdoc requires Python 3.9+')
 
 
 def _discover_tests():
@@ -58,5 +58,5 @@ def _discover_tests():
             'write_to': os.path.join('pdoc', '_version.py'),
         },
         test_suite="setup._discover_tests",
-        python_requires='>= 3.7',
+        python_requires='>= 3.9',
     )