- fixed build test for Python 3.12, which is now a "pure" Python wheel;

- trying to run tests on Python 3.13; we'll see if GitHub has it;

.github/workflows/tests.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest, macos-latest, windows-latest ]
-        python: [ '3.8', '3.9', 'pypy-3.9', '3.10', '3.11', '3.12' ]
+        python: [ '3.8', '3.9', 'pypy-3.9', '3.10', '3.11', '3.12', '3.13' ]
 
     steps:
     - uses: actions/checkout@v3
@@ -75,7 +75,7 @@ jobs:
     container: ${{ matrix.container }}
     strategy:
       matrix:
-        python_version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+        python_version: ['3.8', '3.9', '3.10', '3.11']
         include:
           - os: ubuntu-latest
             container: quay.io/pypa/manylinux2014_x86_64 # https://github.com/pypa/manylinux