Fix PictureField type hints

[amureki]

Greetings!

I just noticed that my editor warns me about wrong types, when I am writing the following code:

image = PictureField(
        file_types=["WEBP", "JPEG"],  # Expected type '[str] | None', got 'list[str]' instead
        aspect_ratios=["3/1", "3/2", "1/1", "15/2", "1.91"],  # Expected type '[str | Fraction | None] | None', got 'list[str]' instead 
    )

I decided to go ahead and mark the types for these args as lists.

Cheers,
Rust

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (371e169) to head (db29b31).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #212   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           13        13           
  Lines          496       496           
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  Hits           496       496           

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dramatiq	85.08% <ø> (ø)
drf	96.37% <ø> (ø)
macos-latest	88.70% <ø> (ø)
py3.10	88.50% <ø> (ø)
py3.12	88.50% <ø> (ø)
py3.13	88.50% <ø> (ø)
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[codingjoe]