benchmark_driver: Stop using Ractor#take

Author: byroot

benchmark/lib/benchmark_driver/runner/ractor.rb

@@ -87,7 +87,7 @@ def render(results:)
 <% end %>
 
 # Wait for all Ractors before executing code to write results
-__bmdv_ractors.map!(&:take)
+__bmdv_ractors.map!(&:value)
 
 <% results.each do |result| %>
 File.write(<%= result.dump %>, __bmdv_ractors.shift)