Fix Rails/SaveBang offenses

Fixes Rails/SaveBang cop for spec files in spec/services/milestones/*

.rubocop_todo.yml

@@ -1144,9 +1144,6 @@ Rails/SaveBang:
     - 'spec/services/issuable/clone/attributes_rewriter_spec.rb'
     - 'spec/services/issuable/common_system_notes_service_spec.rb'
     - 'spec/services/labels/promote_service_spec.rb'
-    - 'spec/services/milestones/destroy_service_spec.rb'
-    - 'spec/services/milestones/promote_service_spec.rb'
-    - 'spec/services/milestones/transfer_service_spec.rb'
     - 'spec/services/notes/create_service_spec.rb'
     - 'spec/services/notification_recipients/build_service_spec.rb'
     - 'spec/services/notification_service_spec.rb'

changelogs/unreleased/rails-save-bang-33.yml

+---
+title: Fix Rails/SaveBang offenses for spec files in spec/services/milestones/*
+merge_request: 42775
+author: Rajendra Kadam
+type: other

spec/services/milestones/destroy_service_spec.rb

@@ -45,7 +45,7 @@ RSpec.describe Milestones::DestroyService do
       let(:group_milestone) { create(:milestone, group: group) }
 
       before do
-        project.update(namespace: group)
+        project.update!(namespace: group)
         group.add_developer(user)
       end
 

spec/services/milestones/promote_service_spec.rb

@@ -23,7 +23,7 @@ RSpec.describe Milestones::PromoteService do
       end
 
       it 'raises error if project does not belong to a group' do
-        project.update(namespace: user.namespace)
+        project.update!(namespace: user.namespace)
 
         expect { service.execute(milestone) }.to raise_error(described_class::PromoteMilestoneError)
       end

spec/services/milestones/transfer_service_spec.rb

@@ -23,7 +23,7 @@ RSpec.describe Milestones::TransferService do
         new_group.add_maintainer(user)
         project.add_maintainer(user)
         # simulate project transfer
-        project.update(group: new_group)
+        project.update!(group: new_group)
       end
 
       context 'without existing milestone at the new group level' do