We require Python 3.9 now

Also update cibuildwheel and upload-artifact

.github/workflows/cibuildwheel.yml

@@ -12,7 +12,7 @@ jobs:
         os: [ubuntu-20.04, windows-2019, macos-13, macos-14]
     env:
       # Seems to have trouble parsing our setup.py, thus:
-      CIBW_PROJECT_REQUIRES_PYTHON: ">=3.8"
+      CIBW_PROJECT_REQUIRES_PYTHON: ">=3.9"
       # Install numpy with a wheel (do NOT compile it):
       CIBW_BEFORE_BUILD: "pip install --only-binary :all: -r requirements.txt"
       # There are/were no numpy wheels for these:
@@ -35,13 +35,13 @@ jobs:
           git checkout c6120cde9ba9de1ca98a92efad5037a2f1643214
           cd ..
 
-
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.16.5
+        uses: pypa/cibuildwheel@v2.19.1
         with:
           package-dir: biopython
           output-dir: wheelhouse
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
+          name: cibw-wheels-${{ matrix.os }}-${{ strategy.job-index }}
           path: ./wheelhouse/*.whl