chore(deps): update dependency websockets to v16

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This PR contains the following updates:

Package	Change	Age	Confidence
websockets (changelog)	~=15.0.1 → ~=16.0.0

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Release Notes

python-websockets/websockets (websockets)

v16.0

Compare Source

See https://websockets.readthedocs.io/en/stable/project/changelog.html for details.

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[github-actions]

✅ Backend requirements.txt updated

Generated from backend/uv.lock using uv export --no-hashes --frozen > requirements.txt

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