[image_picker_ios] Replace deprecated kUTTypeImage/kUTTypeMovie with UTType API

[ledexsoft]

Fixes iOS deprecation warnings surfaced when building with Flutter 3.44.8 / Xcode 26 (iOS 26 SDK):

warning: 'kUTTypeImage' is deprecated: first deprecated in iOS 15.0 - Use UTTypeImage instead [-Wdeprecated-declarations]
warning: 'kUTTypeMovie' is deprecated: first deprecated in iOS 15.0 - Use UTTypeMovie instead [-Wdeprecated-declarations]

(FLTImagePickerPlugin.m:130,133)

Cause

launchUIImagePickerWithSource: still adds kUTTypeImage / kUTTypeMovie directly to UIImagePickerController.mediaTypes. The legacy kUTType* constants were deprecated in iOS 15 in favor of the modern UTType API.

Fix

Replaces the deprecated constants with UTTypeImage.identifier / UTTypeMovie.identifier guarded by @available(iOS 14.0, *), keeping the legacy constants as the fallback for iOS 13 (the pod deployment target is 13.0). This mirrors the pattern already merged upstream in #10848 for the same plugin's kUTTypeGIF usages in FLTImagePickerImageUtil.m and FLTImagePickerPhotoAssetUtil.m, which appear to have missed these two call sites in FLTImagePickerPlugin.m.

Verification

• clang -fsyntax-only -fobjc-arc against the iOS 26 simulator SDK (deployment target 13.0) passes.
• Version bumped to 0.8.13+8 with CHANGELOG entry, following the convention of [image_picker_ios] Fix deprecated kUTTypeGIF usage #10848.

Detected with Flutter 3.44.8 / Xcode 26 (iOS 26 SDK).

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[gemini-code-assist]

Code Review

This pull request replaces the deprecated kUTTypeImage and kUTTypeMovie with UTTypeImage and UTTypeMovie on iOS 14.0+ to resolve deprecation warnings, importing the UniformTypeIdentifiers framework. Feedback suggests simplifying the conditional initialization of the media type variables by setting the fallback values as defaults, which eliminates the need for the else blocks.

[gemini-code-assist]

This code can be simplified by initializing the type variables with their fallback values directly, avoiding the need for the else blocks and making the code more concise and readable.

  if (context.includeImages) {
    NSString *imageType = (NSString *)kUTTypeImage;
    if (@available(iOS 14.0, *)) {
      imageType = UTTypeImage.identifier;
    }
    [mediaTypes addObject:imageType];
  }
  if (context.includeVideo) {
    NSString *movieType = (NSString *)kUTTypeMovie;
    if (@available(iOS 14.0, *)) {
      movieType = UTTypeMovie.identifier;
    }
    [mediaTypes addObject:movieType];
    imagePickerController.videoQuality = UIImagePickerControllerQualityTypeHigh;
  }

[ledexsoft]

Applied — the legacy kUTType constants are now the default value and the modern UTType overrides them on iOS 14+, which removes the else branches. Pushed in 9df0432.