Migrate from image_gallery_saver to gal

image_gallery_saver 2.0.3 -> gal 2.3.1

`image_gallery_saver` as been compromised and hasn't been update since 2 years.

Gal (https://pub.dev/packages/gal) is the recommended alternative.

Rewrote part of `downloadImage` to use gal, removed file naming.

Author: Renarde-dev

lib/network/images.dart

@@ -6,7 +6,7 @@ import 'package:extended_text/extended_text.dart';
 import 'package:file_picker/file_picker.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter_local_notifications/flutter_local_notifications.dart';
-import 'package:image_gallery_saver/image_gallery_saver.dart';
+import 'package:gal/gal.dart';
 import 'package:path/path.dart' as path;
 import 'package:path_provider/path_provider.dart';
 import 'package:piwigo_ng/models/album_model.dart';
@@ -302,10 +302,7 @@ Future<XFile?> downloadImage(
       },
       outputPath: localPath,
     );
-    await ImageGallerySaver.saveFile(
-      localPath,
-      name: image.name,
-    );
+    await Gal.putImage(localPath);
     return XFile(localPath);
   } on DioException catch (e) {
     debugPrint("Download images: ${e.message}");

pubspec.yaml

@@ -52,7 +52,7 @@ dependencies:
   flutter_local_notifications: ^17.2.4 # Throws notifications on download or upload
   open_filex: ^4.4.0 # Open files with devices apps
   workmanager: ^0.5.2 # Background processes (auto upload)
-  image_gallery_saver: ^2.0.3 # Download images
+  gal: ^2.3.1 # Download images
 
   # Utils
   mime_type: ^1.0.0 # Check mime type of files (differentiate photos from videos)