Try again with py38 only

.github/workflows/publish-to-pypi.yaml

@@ -8,18 +8,18 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@main
-      - name: Set up Python 3.9
+      - name: Set up Python 3.8
         uses: actions/setup-python@v1
         with:
-          python-version: 3.9
+          python-version: 3.8
       - name: Install build tools
         run: |
           python -m pip install build setuptools_scm wheel
           python -m pip install numpy==1.19 cython pyfftw
       - name: Build a binary wheel and a source tarball
         uses: RalfG/[email protected]_x86_64
         with:
-          python-versions: 'cp38-cp38m cp39-cp39m'
+          python-versions: 'cp38-cp38m'
           build-requirements: 'cython numpy'
       - name: Copy manylinux wheel into the dist directory
         run: |

pyproject.toml

@@ -8,7 +8,7 @@ requires = ["setuptools>=30.3.0",
 build-backend = "setuptools.build_meta"
 
 [tool.black]
-target-version = ['py38', 'py39']
+target-version = ['py38',]
 exclude = '''
 /(
     \.git