[Fix issue #239] Adjust timm imports and update requirements.txt

[pm25]

What does this PR do?

Fixes #239

This PR addresses the import error described in issue #239:

ModuleNotFoundError: No module named 'timm.models.layers.helpers'

The error arises because the import path in the timm library has changed in newer versions. Following the suggestions from @wpsapp123, @CHR-ray, and @thunguyenth (see: #239), this PR updates the import statements to match the new structure of the timm library.

Additionally, I have updated requirements.txt to specify timm>=1.0.11, which is the minimum version required to ensure compatibility with the new import path and prevent this error in the future.

Does your PR introduce any breaking changes? If yes, please list them.

No.

I have verified that the updated timm version (>=1.0.11) is compatible with the minimal versions of the other packages listed in requirements.txt. I also tested the FixMatch implementation to confirm that it continues to work as expected.

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