Reduce worker_manager memory allocation (#4435)

pubspec.yaml

@@ -143,8 +143,6 @@ dependencies:
 
   uuid: 3.0.7
 
-  flutter_downloader: 1.12.0
-
   external_path: 2.2.0
 
   path_provider: 2.1.5
@@ -177,7 +175,11 @@ dependencies:
 
   percent_indicator: 4.2.2
 
-  worker_manager: 5.0.3
+  # TODO: Replace with upstream when https://github.com/dsrenesanse/worker_manager/pull/123 is merged
+  worker_manager:
+    git:
+      url: https://github.com/linagora/worker_manager.git
+      ref: hotfix/worker-init-memory-leak
 
   async: 2.13.0
 
@@ -211,8 +213,6 @@ dependencies:
 
   intl: 0.20.2
 
-  workmanager: 0.9.0+3
-
   flutter_typeahead: 5.0.2
 
   flutter_keyboard_visibility: 6.0.0