Fix sqlite tests issue

Author: cupatea

test/unit/scheduler_test.rb

@@ -71,7 +71,7 @@ class SchedulerTest < ActiveSupport::TestCase
 
   test "updates metadata after adding dynamic task post-start" do
     scheduler = SolidQueue::Scheduler.new(recurring_tasks: {}).tap do |s|
-      s.define_singleton_method(:interruptible_sleep) { |interval| } # avoid real sleeping
+      s.define_singleton_method(:interruptible_sleep) { |interval| sleep 0.1 }
       s.start
     end
 
@@ -110,7 +110,7 @@ class SchedulerTest < ActiveSupport::TestCase
     )
 
     scheduler = SolidQueue::Scheduler.new(recurring_tasks: {}).tap do |s|
-      s.define_singleton_method(:interruptible_sleep) { |interval| } # avoid real sleeping
+      s.define_singleton_method(:interruptible_sleep) { |interval| sleep 0.1 }
       s.start
     end