Bump letpot to 0.6.4 (#157781) #1330

Job	Run time
Collect information & changes data	1s
Prepare dependencies	1s
Prepare pre-commit base	1s
Check ${{ matrix.file }}	1s
Check ruff-format	1s
Check ruff	1s
Check other linters	1s
Check hassfest	1s
Audit licenses	1s
Check pylint	1s
Check pylint on tests	1s
Split tests for full run	1s
Check all requirements	1s
Dependency review	1s
Check mypy	1s
Run ${{ matrix.mariadb-group }} tests Python ${{ matrix.python-version }}	1s
Run tests Python ${{ matrix.python-version }} (${{ matrix.group }})	1s
Run tests Python ${{ matrix.python-version }} (${{ matrix.group }})	1s
Run ${{ matrix.postgresql-group }} tests Python ${{ matrix.python-version }}	1s
Upload test coverage to Codecov (partial suite)	1s
Upload test coverage to Codecov (full suite)	1s
Upload test results to Codecov	1s
	22s

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