Update to python3.12

The Issue https://community.opengroup.org/osdu/platform/security-and-compliance/policy/-/issues/150 haven't resolved CVE-2024-6345:

• Updated Python version to address CVE
• Fixed quote in Dockerfile (/bin/sh: 1: Syntax error: Unterminated quoted string):

app/Dockerfile

-FROM python:3.11.11-alpine
+FROM python:3.12.8-alpine
 
 # set environment variables
 # PYTHONDONTWRITEBYTECODE - Prevents Python from writing pyc files to disc (equivalent to python -B option)