Memory leak in python binding

[korzck]

Describe the bug

Currently building service that operates with large number of vw models. I noticed memory increase for each model load iteration and checked for vw heap size.

Memory before:
420471734272
Memory after few iterations:
420633214976

This small diff gives constant increase in memory

How to reproduce

import psutil
import vowpalwabbit
NEW_MODEL_CONFIG = f"""
    -i model.bin --cb_explore_adf --quiet --epsilon 0.1 -q UA -q UC \
    --l2 0.002 \
    --learning_rate 0.5 \
    --power_t 0.5
    """

def my_func():
    model = vowpalwabbit.Workspace(NEW_MODEL_CONFIG)
    
    ex = model.parse(
        """
        shared |User user_id=123 user_name=John Doe [email protected] user_age=30 user_gender=male
        0:-1.0:1 |Action variant=variant1 
        |Action variant=variant2 
        |Action variant=variant3 
        """,
        vowpalwabbit.LabelType.CONTEXTUAL_BANDIT,
    )
    model.learn(ex)
    model.finish()
    del ex
    del model

if __name__ == '__main__':
    print(psutil.Process().memory_full_info().vms)
    for i in range(100):
        my_func()
    print(psutil.Process().memory_full_info().vms)
    

which prints smth like this:

420471734272
420633214976

Version

9.10.0

OS

macOS

Language

Python

Additional context

No response