fix warning

mobile/lib/presentation/widgets/images/image_provider.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:async/async.dart';
 import 'package:flutter/widgets.dart';
 import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
@@ -51,14 +53,14 @@ mixin CancellableImageProviderMixin<T extends Object> on CancellableImageProvide
   Stream<ImageInfo> loadRequest(ImageRequest request, ImageDecoderCallback decode) async* {
     if (isCancelled) {
       this.request = null;
-      evict();
+      unawaited(evict());
       return;
     }
 
     try {
       final image = await request.load(decode);
       if (image == null || isCancelled) {
-        evict();
+        unawaited(evict());
         return;
       }
       yield image;