lint-and-test: Add support for testing against Python 3.12-dev.

Author: neiljp

.github/workflows/lint-and-test.yml

@@ -203,6 +203,7 @@ jobs:
           - {PYTHON: 3.9, OS: ubuntu-latest, NAME: "CPython 3.9 (ubuntu)", EXPECT: "Linux"}
           - {PYTHON: "3.10", OS: ubuntu-latest, NAME: "CPython 3.10 (ubuntu)", EXPECT: "Linux"}
           - {PYTHON: "3.11", OS: ubuntu-latest, NAME: "CPython 3.11 (ubuntu)", EXPECT: "Linux"}
+          - {PYTHON: "3.12-dev", OS: ubuntu-latest, NAME: "CPython 3.12 (ubuntu)", EXPECT: "Linux"}
           - {PYTHON: 'pypy-3.7', OS: ubuntu-latest, NAME: "PyPy 3.7 (ubuntu)", EXPECT: "Linux"}
           - {PYTHON: 'pypy-3.8', OS: ubuntu-latest, NAME: "PyPy 3.8 (ubuntu)", EXPECT: "Linux"}
           - {PYTHON: 'pypy-3.9', OS: ubuntu-latest, NAME: "PyPy 3.9 (ubuntu)", EXPECT: "Linux"}