Update Python versions

3.12 was failing to install (pointing at old beta).

Could move to a GHA matrix strategy instead of tox.

test.Dockerfile

@@ -9,7 +9,7 @@ ENV PATH "$PATH:/usr/games"
 
 # Install all other versions of Python we want to test with tox
 RUN git clone https://github.com/pyenv/pyenv /root/.pyenv
-RUN for PYTHON_VERSION in 3.8.17 3.9.17 3.10.12 3.11.4 3.12.0b4; do \
+RUN for PYTHON_VERSION in 3.8.19 3.9.19 3.10.14 3.11.9 3.12.3; do \
   set -ex \
     && /root/.pyenv/bin/pyenv install ${PYTHON_VERSION} \
     && /root/.pyenv/versions/${PYTHON_VERSION}/bin/python -m pip install --upgrade pip \