Memory leak in Core

# Memory leak in Core

## Describe the bug
When running CompreFace Core `1.2.0-mobilenet-gpu` with uwsgi workers, the **RAM usage** of the workers continuously grows until it reaches the pod memory limit and the worker crashes.

## To Reproduce
Steps to reproduce the behavior:

1. Deploy CompreFace Core `1.2.0-mobilenet-gpu` in Kubernetes with uwsgi workers.
2. Send a batch of images for face recognition (various sizes tested).
3. Monitor **RAM usage** of the worker processes (`ps aux`, `kubectl top pod`).
4. Observe that RAM usage continuously increases over time until the pod reaches its memory limit and the worker crashes.

## Expected behavior
The **RAM usage** of the workers should remain stable after processing images, and workers should not crash due to growing RAM usage.

## Screenshots
(Optional) Attach Grafana graphs or logs showing RAM usage growth of uwsgi workers.

## Desktop (please complete the following information)
- OS: Linux (Docker/Kubernetes environment)
- Browser: N/A
- Version: CompreFace Core `1.2.0-mobilenet-gpu`

## Additional context
- Pod memory limits: `minMemory: 5Gi`, `maxMemory: 6Gi`.
- No code modification was done.