Fix regexp cop that was previously excempted

.rubocop_manual_todo.yml

@@ -761,7 +761,6 @@ RSpec/TimecopFreeze:
     - 'ee/spec/lib/gitlab/analytics/cycle_analytics/summary/group/stage_time_summary_spec.rb'
     - 'ee/spec/lib/gitlab/analytics/type_of_work/tasks_by_type_spec.rb'
     - 'ee/spec/lib/gitlab/auth/group_saml/sso_enforcer_spec.rb'
-    - 'ee/spec/lib/gitlab/database/load_balancing/host_spec.rb'
     - 'ee/spec/lib/gitlab/geo/base_request_spec.rb'
     - 'ee/spec/lib/gitlab/geo/event_gap_tracking_spec.rb'
     - 'ee/spec/lib/gitlab/geo/git_push_http_spec.rb'
@@ -2915,7 +2914,6 @@ Style/RegexpLiteralMixedPreserve:
     - 'ee/spec/controllers/groups/groups_controller_spec.rb'
     - 'ee/spec/features/groups/saml_enforcement_spec.rb'
     - 'ee/spec/features/markdown/metrics_spec.rb'
-    - 'ee/spec/lib/gitlab/database/load_balancing/load_balancer_spec.rb'
     - 'ee/spec/services/jira/requests/issues/list_service_spec.rb'
     - 'lib/api/invitations.rb'
     - 'lib/gitlab/ci/pipeline/expression/lexeme/pattern.rb'

spec/lib/gitlab/database/load_balancing/load_balancer_spec.rb

@@ -294,7 +294,7 @@ RSpec.describe Gitlab::Database::LoadBalancing::LoadBalancer, :request_store do
 
   describe '#primary_write_location' do
     it 'returns a String in the right format' do
-      expect(lb.primary_write_location).to match(/[A-F0-9]{1,8}\/[A-F0-9]{1,8}/)
+      expect(lb.primary_write_location).to match(%r{[A-F0-9]{1,8}/[A-F0-9]{1,8}})
     end
 
     it 'raises an error if the write location could not be retrieved' do