Remove project arg from UpdateService, as un-used

This will help group cluster controller to re-use this service

app/controllers/projects/clusters_controller.rb

@@ -42,7 +42,7 @@ class Projects::ClustersController < Projects::ApplicationController
 
   def update
     Clusters::UpdateService
-      .new(project, current_user, update_params)
+      .new(current_user, update_params)
       .execute(cluster)
 
     if cluster.valid?

app/services/clusters/update_service.rb

 # frozen_string_literal: true
 
 module Clusters
-  class UpdateService < BaseService
+  class UpdateService
+    attr_reader :current_user, :params
+
+    def initialize(user = nil, params = {})
+      @current_user, @params = user, params.dup
+    end
+
     def execute(cluster)
       cluster.update(params)
     end

spec/services/clusters/update_service_spec.rb

@@ -2,7 +2,7 @@ require 'spec_helper'
 
 describe Clusters::UpdateService do
   describe '#execute' do
-    subject { described_class.new(cluster.project, cluster.user, params).execute(cluster) }
+    subject { described_class.new(cluster.user, params).execute(cluster) }
 
     let(:cluster) { create(:cluster, :project, :provided_by_user) }