Change paginate number to 20

ee/app/models/vulnerabilities/occurrence.rb

@@ -7,7 +7,7 @@ module Vulnerabilities
 
     self.table_name = "vulnerability_occurrences"
 
-    paginates_per 10
+    paginates_per 20
 
     # Used for both severity and confidence
     LEVELS = {

ee/changelogs/unreleased/8587-20-vulnerabilities.yml

+---
+title: Change paginate number to 20
+merge_request: 9213
+author:
+type: changed

ee/spec/controllers/groups/security/vulnerabilities_controller_spec.rb

@@ -79,7 +79,7 @@ describe Groups::Security::VulnerabilitiesController do
           end
 
           it "returns a list of vulnerabilities" do
-            get :index, params: { group_id: group, page: 3 }, format: :json
+            get :index, params: { group_id: group, page: 2 }, format: :json
 
             expect(response).to have_gitlab_http_status(200)
             expect(json_response).to be_an(Array)