fix: Update spec

spec/lib/tasks/scaleway/storage/migrate_from_local_task_spec.rb

@@ -3,13 +3,15 @@
 require "spec_helper"
 
 describe "rake scaleway:storage:migrate_from_local", type: :task do
+  before do
+    allow(ActiveStorage::Migrator).to receive(:migrate!).with(:local, :scaleway).and_return(true)
+  end
+
   it "preloads the Rails environment" do
     expect(task.prerequisites).to include "environment"
   end
 
   it "invokes the migrator" do
-    expect(ActiveStorage::Migrator).to receive(:migrate!).with(:local, :scaleway).and_return(true)
-
     task.execute
   end
 end