Bump up logger-1.6.5 for TruffleRuby

Author: hsbt

tool/bundler/dev_gems.rb

@@ -13,7 +13,7 @@
 gem "rspec-expectations", "~> 3.12"
 gem "rspec-mocks", "~> 3.12"
 gem "uri", "~> 0.13.0"
-gem "logger", "~> 1.6.4"
+gem "logger", "~> 1.6.5"
 
 group :doc do
   gem "nronn", "~> 0.11.1", platform: :ruby