fix requirement bug, fix server.py bug

[whn09]

Issue #, if available:

• https://github.com/aws-samples/amazon-nova-samples/issues/142

Description of changes:

• Change requests=2.32.3 to requests==2.32.3
• Add event_type = None and forward_task = None to websocket_handler to avoid some errors

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[whn09]

Sorry, this is a mistake. The two lines should not be commented.