Fix pydantic warnings in purpleair (#133247) #15551

Job	Run time
Collect information & changes data	17s
Prepare dependencies (3.12)	2m 10s
Prepare pre-commit base	13s
Check Dockerfile	13s
Check Dockerfile.dev	15s
Check script/hassfest/docker/Dockerfile	12s
Prepare dependencies (3.13)	1m 44s
Check ruff	18s
Check ruff-format	21s
Check other linters	1m 2s
Check hassfest	43s
Check all requirements	16s
Check mypy	59s
Check pylint	8m 8s
Audit licenses (3.12)	22s
Audit licenses (3.13)	29s
Check pylint on tests	5m 50s
Run ${{ matrix.postgresql-group }} tests Python ${{ matrix.python-version }}	0s
Run tests Python ${{ matrix.python-version }} (${{ matrix.group }})	0s
Split tests for full run	0s
Run ${{ matrix.mariadb-group }} tests Python ${{ matrix.python-version }}	0s
Upload test coverage to Codecov (partial suite)	0s
Run tests Python ${{ matrix.python-version }} (${{ matrix.group }})	0s
Upload test coverage to Codecov (full suite)	0s
	23m 32s

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