Fix intermittently failing test

This assertion fails in about 1/50 CI builds when the insertions
happen in different seconds (eg. at 0.9999s then at 1.0001s)

So, we could assert `be_within().of(Time.now)` but really, we
don't need this assertion at all. I don't see what it has to do
with the `update_columns` method. Maybe I'm missing something?

spec/models/widget_spec.rb

@@ -271,7 +271,6 @@ RSpec.describe Widget, type: :model do
       expect(widget.versions.count).to eq(2)
       expect(widget.versions.last.event).to(eq("update"))
       expect(widget.versions.last.changeset[:name]).to eq([nil, "Bugle"])
-      expect(widget.versions.last.created_at.to_i).to eq(Time.now.to_i)
     end
   end