correct flaky spec

spec/components/scheduler/manager_spec.rb

@@ -77,7 +77,7 @@ describe Scheduler::Manager do
     ActiveRecord::Base.connection_pool.connections.reject { |c| c.in_use? }.each do |c|
       ActiveRecord::Base.connection_pool.remove(c)
     end
-    expect(ActiveRecord::Base.connection_pool.connections.length).to eq(1)
+    expect(ActiveRecord::Base.connection_pool.connections.length).to (be <= 1)
 
     on_thread_mismatch = lambda do
       current = Thread.list.map { |t| t.object_id }