[image_picker_ios] Fix deprecated kUTTypeGIF usage

[ritoban23]

[image_picker_ios] Fix deprecated kUTTypeGIF usage

This PR replaces the deprecated kUTTypeGIF constant with the modern UTTypeGIF API to fix iOS 15+ deprecation warnings in the image_picker_ios plugin.

Changes:

• Added UniformTypeIdentifiers framework import to affected files
• Replaced kUTTypeGIF with UTTypeGIF.identifier for iOS 14+
• Added @available(iOS 14.0, *) checks to maintain backward compatibility with iOS 13

The minimum iOS deployment target is 13.0, so the code uses conditional compilation to support both the new API (iOS 14+) and the deprecated API (iOS 13) where necessary.

Files changed:

• FLTImagePickerImageUtil.m - Updated GIF image source type hint
• FLTImagePickerPhotoAssetUtil.m - Updated GIF destination type

Fixes flutter/flutter#181291

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[gemini-code-assist]

Code Review

This pull request correctly addresses the deprecation of kUTTypeGIF by using the UTTypeGIF API on iOS 14 and newer, with a proper fallback for older versions. The changes are implemented correctly in both FLTImagePickerImageUtil.m and FLTImagePickerPhotoAssetUtil.m, and the version and changelog updates are appropriate. I have one minor suggestion to improve code consistency between the two modified Objective-C files. Otherwise, the changes look good.

[gemini-code-assist]

To improve consistency with the pattern used in FLTImagePickerPhotoAssetUtil.m and to enhance readability, consider defining the GIF type identifier in a local variable before using it. This separates the logic for determining the identifier from its usage and avoids repeating the dictionary key.

Suggested change

	if (@available(iOS 14.0, *)) {
	options[(NSString *)kCGImageSourceTypeIdentifierHint] = UTTypeGIF.identifier;
	} else {
	options[(NSString *)kCGImageSourceTypeIdentifierHint] = (NSString *)kUTTypeGIF;
	}
	NSString *gifTypeIdentifier;
	if (@available(iOS 14.0, *)) {
	gifTypeIdentifier = UTTypeGIF.identifier;
	} else {
	gifTypeIdentifier = (NSString *)kUTTypeGIF;
	}
	options[(NSString *)kCGImageSourceTypeIdentifierHint] = gifTypeIdentifier;

References

1. The repository style guide (lines 10-12) states that code should follow relevant style guides for each language. The suggestion to improve consistency and avoid repetition aligns with general Objective-C best practices for writing maintainable and readable code. ^(link)

[stuartmorgan-g]

test-exempt: code refactor with no semantic change