Bump ruby version to 2.5.3 on capistrano

Author: andreslucena

config/deploy.rb

@@ -8,7 +8,7 @@
 
 set :rbenv_type, :user
 set :delayed_job_workers, 1
-set :rbenv_ruby, '2.5.1'
+set :rbenv_ruby, '2.5.3'
 
 append :linked_files, "config/application.yml"
 append :linked_dirs, "log", "tmp/pids", "tmp/cache", "tmp/sockets", "public/system", "public/assets", "public/uploads", "vendor/bundle"