remove unneeded type attributes on WebsocketNotification #206075

Job	Run time
Collect information & changes data	13s
Prepare dependencies (3.12)	12s
Prepare pre-commit base	13s
Check pylint	24s
Check all requirements	16s
Check hassfest	39s
Audit licenses	0s
Check mypy	30s
Split tests for full run	0s
Check pylint on tests	31s
Check other linters	23s
Check ruff	16s
Check ruff-format	15s
Run tests Python 3.12 (bang_olufsen)	1m 29s
Run ${{ matrix.postgresql-group }} tests Python ${{ matrix.python-version }}	0s
Run ${{ matrix.mariadb-group }} tests Python ${{ matrix.python-version }}	0s
Run tests Python ${{ matrix.python-version }} (${{ matrix.group }})	0s
Upload test coverage to Codecov (full suite)	0s
Upload test coverage to Codecov (partial suite)	19s
	5m 40s

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