Fix crash by replacing deprecated logger.warn with logger.warning

[Tomo1151]

Description

This pull request fixes an AttributeError: 'Logger' object has no attribute 'warn' that occurs during inference.

In Python 3.13, the warn() method has been removed, leading to a crash. Replacing it with warning(), the standard recommended method, resolves this issue and ensures the tool remains usable in modern environments.

Changes

• Updated src/sharp/utils/io.py: Changed LOGGER.warn() to LOGGER.warning().
• Verified using grep -r --include="*.py" "\.warn(" . that no other occurrences of .warn() exist within the src directory.

Impact

This is a non-breaking change that prevents the application from crashing when EXIF data (focal length) is missing from input images.

Testing

• Verified the fix by running the prediction CLI. The error no longer occurs, and the fallback message is correctly logged using .warning().

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