Update python Docker tag to v3.12.3

Author: renovate[bot]

.python-version

@@ -1 +1 @@
-3.12.2
+3.12.3

Dockerfile

@@ -5,7 +5,7 @@ RUN apt-get update \
     && apt-get install -y --no-install-recommends git \
     && sed -i "s/^\(GIT_COMMIT_HASH = \).*\$/\1'$(git rev-parse HEAD)'/" slackbot_settings.py
 
-FROM python:3.12.2-slim-bullseye
+FROM python:3.12.3-slim-bullseye
 
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]