Relax assert_in_delta since MySQL's timestamp has no precision by default

https://buildkite.com/rails/rails/builds/114642#0193b421-2814-4454-8106-54330e254cac/1234-1244

Author: kamipo

activerecord/test/cases/dirty_test.rb

@@ -949,7 +949,7 @@ def check_around
       aircraft.reload
 
       assert_equal "Boeing", aircraft.name
-      assert_in_delta Time.now, aircraft.manufactured_at, 1
+      assert_in_delta Time.now, aircraft.manufactured_at, 1.1
     end
   end
 

activerecord/test/cases/fixtures_test.rb

@@ -481,7 +481,7 @@ def test_insert_with_default_function
     create_fixtures("aircrafts")
 
     aircraft = Aircraft.find_by(name: "boeing-with-no-manufactured-at")
-    assert_in_delta Time.now, aircraft.manufactured_at, 1
+    assert_in_delta Time.now, aircraft.manufactured_at, 1.1
   end
 
   def test_insert_with_default_value