Require Python >= 3.9

Since numpy does also require it now, and 3.8 EOL is already in October, this seems acceptable to me.

.github/workflows/build.yml

@@ -8,8 +8,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [windows-latest]
-        # os: [ubuntu-latest, windows-latest, macos-13, macos-14]
+        os: [ubuntu-latest, windows-latest, macos-13, macos-14]
 
     steps:
       - uses: actions/checkout@v4

pyproject.toml

@@ -7,12 +7,6 @@ requires = [
 build-backend = "setuptools.build_meta"
 
 [tool.cibuildwheel]
-# Cannot run tests on arm64 macosx python 3.8
-# See https://github.com/pypa/cibuildwheel/pull/1169
-test-skip=[
-    "cp38-macosx_*:arm64",
-    "cp*",
-]
 test-requires=[
     "pytest"
 ]

setup.py

@@ -33,7 +33,7 @@ def get_readme_contents():
     long_description_content_type='text/markdown',
     license='ISC',
     ext_modules=ext_modules,
-    python_requires='>=3.8',
+    python_requires='>=3.9',
     install_requires=['numpy'],
     extras_require={'test': 'pytest'},
     cmdclass=dict(build_ext=build_ext),