fix: return self for classmethods of roborockmodeenum

[Lash-L]

This allows type checkers to understand the proper typing of the object.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
roborock/data/code_mappings.py	88.88% <100.00%> (+0.09%)	⬆️

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[Copilot]

Pull request overview

This PR improves type checking for the RoborockModeEnum class by replacing explicit RoborockModeEnum return type annotations with Self. This allows type checkers to correctly infer that subclasses of RoborockModeEnum return their own type rather than the base class type.

Key changes:

• Added Self import from the typing module
• Updated return type annotations for __new__, from_code, from_value, and from_name methods to use Self

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[allenporter]

Thanks for fixing this. I had the impression this required a newer version of python but maybe i'm mixing it up with another feature.