fix: revert python version upgrade to 3.12 (#1331)

Author: ahmed-arb

CHANGELOG.md

@@ -51,7 +51,7 @@ instructions, because git commits are used to generate release notes:
 
 - [Bugfix] Add correct EVENT_BUS_REDIS_CONNECTION_URL settings for event-bus. (by @Faraz32123)
 
-- [Bugfix] The version of Python and Node.js were behind what edx-platform currently supports so update both. Python is now 3.12 and Node.js is now 24.
+- [Bugfix] Update Node.js to version 24. Python remains at 3.11 as upstream edx-platform does not fully support it yet.
 
 <a id='changelog-20.0.5'></a>
 ## v20.0.5 (2026-01-07)

tutor/templates/build/openedx/Dockerfile

@@ -29,9 +29,9 @@ RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
 # Install pyenv
 # https://www.python.org/downloads/
 # https://github.com/pyenv/pyenv/releases
-ARG PYTHON_VERSION=3.12.12
+ARG PYTHON_VERSION=3.11.8
 ENV PYENV_ROOT=/opt/pyenv
-RUN git clone https://github.com/pyenv/pyenv $PYENV_ROOT --branch v2.6.20 --depth 1
+RUN git clone https://github.com/pyenv/pyenv $PYENV_ROOT --branch v2.3.36 --depth 1
 
 # Install Python
 RUN $PYENV_ROOT/bin/pyenv install $PYTHON_VERSION