Add unawaited_futures (#1148)

desktop_photo_search/fluent_ui/lib/src/unsplash/unsplash.dart

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'dart:async';
 import 'dart:convert';
 import 'dart:typed_data';
 
@@ -86,10 +87,10 @@ class Unsplash {
     });
 
     _log.info('GET ${photo.links!.downloadLocation}');
-    http.get(Uri.parse(photo.links!.downloadLocation!), headers: {
+    unawaited(http.get(Uri.parse(photo.links!.downloadLocation!), headers: {
       'Accept-Version': 'v1',
       'Authorization': 'Client-ID $_accessKey',
-    });
+    }));
 
     return futureBytes;
   }