[image_picker] Fix getMedia on Linux (#8811)

The previous version had a typo where it specified the mime types using the `extensions` field.

~~part of flutter/flutter#148635

## Pre-Review Checklist

Author: Ape

packages/image_picker/image_picker_linux/CHANGELOG.md

@@ -1,6 +1,7 @@
-## NEXT
+## 0.2.1+2
 
 * Updates minimum supported SDK version to Flutter 3.22/Dart 3.4.
+* Fixes `getMedia` mime types.
 
 ## 0.2.1+1
 

packages/image_picker/image_picker_linux/lib/image_picker_linux.dart

@@ -161,7 +161,9 @@ class ImagePickerLinux extends CameraDelegatingImagePickerPlatform {
   @override
   Future<List<XFile>> getMedia({required MediaOptions options}) async {
     const XTypeGroup typeGroup = XTypeGroup(
-        label: 'images and videos', extensions: <String>['image/*', 'video/*']);
+      label: 'Images and videos',
+      mimeTypes: <String>['image/*', 'video/*'],
+    );
 
     List<XFile> files;
 

packages/image_picker/image_picker_linux/pubspec.yaml

@@ -2,7 +2,7 @@ name: image_picker_linux
 description: Linux platform implementation of image_picker
 repository: https://github.com/flutter/packages/tree/main/packages/image_picker/image_picker_linux
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+image_picker%22
-version: 0.2.1+1
+version: 0.2.1+2
 
 environment:
   sdk: ^3.4.0

packages/image_picker/image_picker_linux/test/image_picker_linux_test.dart

@@ -133,7 +133,7 @@ void main() {
       final VerificationResult result = verify(
           mockFileSelectorPlatform.openFiles(
               acceptedTypeGroups: captureAnyNamed('acceptedTypeGroups')));
-      expect(capturedTypeGroups(result)[0].extensions,
+      expect(capturedTypeGroups(result)[0].mimeTypes,
           <String>['image/*', 'video/*']);
     });