fix: python process worker

[ClemDoum]

Description

Python multiprocessing is not trivial to handle consistently access on the different OS + the pyinstaller executable. Using the wrong setup trigger problems such as workers not launching or hanging at application shutdown.

This PRs aims at fixing these issues.

Changes

neo4j-app

Fixed

• switch to python >= 3.10.8 in order to avoid: benefit from cpython fix
• switched back from ProcessPoolExecutor to multiprocessing.Pool using the spawn context + maxtasksperchild=1. Using maxtasksperchild=1 allows the child process to be destroyed when it receives SIGTERM or SIGKILL signals. Otherwise probably due to this cpython bug the pool hangs and fails to kill child processes. Since we know that Python workers will only accomplish a single task which is work_forever, using maxtasksperchild=1 is an acceptable hack

Changed

• use pyinstaller==6.3.0 for builds
• updates dependencies