This was a mistake I'd made in 3.x, but this effectively clobbers all `silenced` settings throughout the test suite. With RSpec's random on, this may have interesting side-effects.

I think something a bit safer would be:

```ruby
around do |example|
  cached_silenced = ActiveSupport::Deprecation.silenced
  ActiveSupport::Deprecation.silenced = true
  example.run
  ActiveSupport::Deprecation.silenced = cached_silenced
end
```