Update ruby-buildpack to version 1.7.40 (#769)

Update ruby-buildpack to version 1.7.40

Author: Alan Gabbianelli

production-app-manifest.yml

@@ -2,7 +2,7 @@ applications:
 - name: publish-data-beta-production
   command: bundle exec rake db:migrate db:seed && bin/rails server -b 0.0.0.0 -p $PORT -e $RAILS_ENV
   memory: 512M
-  buildpack: https://github.com/cloudfoundry/ruby-buildpack.git#v1.7.34
+  buildpack: https://github.com/cloudfoundry/ruby-buildpack.git#v1.7.40
   stack: cflinuxfs3
   env:
     RAILS_ENV: production

production-worker-manifest.yml

@@ -1,7 +1,7 @@
 applications:
 - name: publish-data-beta-production-worker
   memory: 1G
-  buildpack: https://github.com/cloudfoundry/ruby-buildpack.git#v1.7.34
+  buildpack: https://github.com/cloudfoundry/ruby-buildpack.git#v1.7.40
   stack: cflinuxfs3
   command: bundle exec sidekiq
   env:

staging-app-manifest.yml

@@ -2,7 +2,7 @@ applications:
 - name: publish-data-beta-staging
   command: bundle exec rake db:migrate db:seed && bin/rails server -b 0.0.0.0 -p $PORT -e $RAILS_ENV
   memory: 512M
-  buildpack: https://github.com/cloudfoundry/ruby-buildpack.git#v1.7.34
+  buildpack: https://github.com/cloudfoundry/ruby-buildpack.git#v1.7.40
   stack: cflinuxfs3
   env:
     RAILS_ENV: staging

staging-worker-manifest.yml

@@ -1,7 +1,7 @@
 applications:
 - name: publish-data-beta-staging-worker
   memory: 1G
-  buildpack: https://github.com/cloudfoundry/ruby-buildpack.git#v1.7.34
+  buildpack: https://github.com/cloudfoundry/ruby-buildpack.git#v1.7.40
   stack: cflinuxfs3
   command: bundle exec sidekiq
   env: