Fix non-sticking collection_cache_versioning config
Fix non-sticking collection_cache_versioning config

NOTE: this setting is not taking effect since it appears
that govuk_notify_rails is causing early rails loading and
causing it to be "lost".

This is a workaround for issue https://github.com/rails/rails/issues/39855#issuecomment-659670294
suggested by this issue comment https://github.com/rails/rails/issues/37030#issuecomment-524511912

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