fix/ remove uncertain time_to_idle cache-option

This options is not [universal](https://github.com/rails/rails/blob/5-2-stable/activesupport/lib/active_support/cache.rb#L23)
And supports only by `ehcache` Java (& JRuby) store

app/models/spree/calculator/avalara_transaction_calculator.rb

@@ -40,7 +40,7 @@ def prev_tax_amount(item)
  end
 
  def get_avalara_response(order)
- Rails.cache.fetch(cache_key(order), time_to_idle: 5.minutes) do
+ Rails.cache.fetch(cache_key(order)) do
  order.avalara_capture
  end
  end
@@ -72,7 +72,7 @@ def cache_key_with_short_hash(order)
  alias_method :cache_key, :cache_key_with_short_hash
 
  def retrieve_rates_from_cache(order)
- Rails.cache.fetch(cache_key(order), time_to_idle: 5.minutes) do
+ Rails.cache.fetch(cache_key(order)) do
  # this is the fallback value written to the cache if there is no value
  order.avalara_capture
  end