Log Message:
devel/ruby-railties60: update to 6.0.3

Update ruby-railties60 to 6.0.3.

## Rails 6.0.3 (May 06, 2020) ##

*   Cache compiled view templates when running tests by default

    When generating a new app without `--skip-spring`, caching classes is
    disabled in `environments/test.rb`. This implicitly disables caching
    view templates too. This change will enable view template caching by
    adding this to the generated `environments/test.rb`:

    ````ruby
    config.action_view.cache_template_loading = true
    ````

    *Jorge Manrubia*

*   `Rails::Application#eager_load!` is available again to load application code
    manually as it was possible in previous versions.

    Please, note this is not integrated with the whole eager loading logic that
    runs when Rails boots with eager loading enabled, you can think of this
    method as a vanilla recursive code loader.

    This ability has been restored because there are some use cases for it, such
    as indexers that need to have all application classes and modules in memory.

    *Xavier Noria*

*   Generators that inherit from NamedBase respect `--force` option

    *Josh Brody*

*   Regression fix: The Rake task `zeitwerk:check` supports eager loaded
    namespaces which do not have eager load paths, like the recently added
    `i18n`. These namespaces are only required to respond to `eager_load!`.

    *Xavier Noria*