Improve PlugwiseCelsius class #1753

Job	Run time
Dependency	3s
Prepare	49s
Shellcheck	6s
Ruff check and force	5s
Check commit	46s
Create pytest cache for Python 3.13	6s
Run pytest using Python 3.13	23s
Run mypy	11s
Process test coverage	11s
Process test complexity	9s
Build and publish Python 🐍 distributions 📦 to TestPyPI	19s
	3m 8s

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