Remove 'helpers' prefix

[karinevieira]

We received the following warning from Phlex:

The `helpers` method is deprecated and will be removed in the next
minor version of phlex-rails.

If you absolutely need to access the underlying Rails view context,
you can do that via the `view_context` method, though this is
not recommended.

It is much safer to use one of the built-in helper adapters or to
register your own adapter via `register_output_helper` or
`register_value_helper`.

See https://beta.phlex.fun/rails/helpers.html

To address this, I have adapted the code to be compatible with the next version, ensuring we follow the recommended practices and avoid future issues with the deprecation of the helpers method.