Try testing against python 3.12 (#1282)

Author: blink1073

.github/workflows/python-tests.yml

@@ -26,6 +26,8 @@ jobs:
             python-version: "pypy-3.8"
           - os: macos-latest
             python-version: "3.10"
+          - os: ubuntu-latest
+            python-version: "3.12"
     steps:
       - name: Checkout
         uses: actions/checkout@v3

pyproject.toml

@@ -273,6 +273,10 @@ filterwarnings = [
   "always:unclosed <socket.socket:ResourceWarning",
   "module:Jupyter is migrating its paths to use standard platformdirs:DeprecationWarning",
   "ignore:jupyter_server.base.zmqhandlers module is deprecated in Jupyter Server 2.0:DeprecationWarning",
+  "ignore:datetime.utcfromtimestamp:DeprecationWarning",
+  "ignore:datetime.utcnow:DeprecationWarning",
+  # ignore pytest warnings.
+  "ignore:::_pytest",
 ]
 
 [tool.coverage.report]