Fixing issues with the WebUI and the optical cybersecurity module

This MR focuses on fixing the issues reported in two issues:

• Closes #57 (closed)
• Closes #102 (closed)

The changes are as follows:

• Version of the Flask package has been updated to fix the issues in the WebUI.
• The tests of the opticalattackdetector have been reworked to fix the issue.

The pipelines are here:

• Optical attack detector: https://labs.etsi.org/rep/tfs/controller/-/jobs/51936
• WebUI: https://labs.etsi.org/rep/tfs/controller/-/pipelines/4220

src/opticalattackdetector/tests/test_unitary.py

@@ -15,6 +15,7 @@
 import logging
 import uuid
 import queue
+import time
 from unittest.mock import patch
 
 import pytest
@@ -36,6 +37,7 @@ LOGGER = logging.getLogger(__name__)
 def optical_attack_detector_service():
     _service = OpticalAttackDetectorService()
     _service.start()
+    time.sleep(2)
     yield _service
     _service.stop()