Update to supported Python versions

Drop Python 3.7 and 3.8 from CI, as both had test failures due to
other packages dropping support for these now EOL versions.

Add Python 3.11 and 3.12 to CI.

.github/workflows/ci.yaml

@@ -6,7 +6,7 @@ jobs:
     strategy:
       max-parallel: 3
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - name: checkout
@@ -20,7 +20,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install -U black pytest pytest-cov
+          pip install -U black pytest pytest-cov setuptools[core]
           python setup.py -q install
 
       - name: Style Check