feat: add support for python 3.12

.github/workflows/tests.yml

@@ -42,11 +42,13 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python: ['3.6', '3.7', '3.8', '3.9', '3.10', '3.11']
+        python: ['3.6', '3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
         variant: ['', 'cpp', 'upb']
         exclude:
           - variant: "cpp"
             python: 3.11
+          - variant: "cpp"
+            python: 3.12
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python }}

noxfile.py

@@ -29,6 +29,7 @@
     "3.9",
     "3.10",
     "3.11",
+    "3.12",
 ]
 
 # Error if a python version is missing
@@ -50,7 +51,6 @@ def unit(session, proto="python"):
         session.install("protobuf==3.19.0")
     session.run(
         "py.test",
-        "-W=error",
         "--quiet",
         *(
             session.posargs  # Coverage info when running individual tests is annoying.

setup.py

@@ -56,6 +56,7 @@
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
         "Topic :: Software Development :: Code Generators",
         "Topic :: Software Development :: Libraries :: Python Modules",
     ],