Update to 2.2.5, bundler 1.13.6, rubygems 2.6.8

Author: docker-library-bot

2.2/Dockerfile

@@ -10,7 +10,7 @@ RUN mkdir -p /usr/local/etc \
 ENV RUBY_MAJOR 2.2
 ENV RUBY_VERSION 2.2.5
 ENV RUBY_DOWNLOAD_SHA256 30c4b31697a4ca4ea0c8db8ad30cf45e6690a0f09687e5d483c933c03ca335e3
-ENV RUBYGEMS_VERSION 2.6.7
+ENV RUBYGEMS_VERSION 2.6.8
 
 # some of ruby's build scripts are written in ruby
 #   we purge system ruby later to make sure our final image uses what we just built

2.2/alpine/Dockerfile

@@ -10,7 +10,7 @@ RUN mkdir -p /usr/local/etc \
 ENV RUBY_MAJOR 2.2
 ENV RUBY_VERSION 2.2.5
 ENV RUBY_DOWNLOAD_SHA256 30c4b31697a4ca4ea0c8db8ad30cf45e6690a0f09687e5d483c933c03ca335e3
-ENV RUBYGEMS_VERSION 2.6.7
+ENV RUBYGEMS_VERSION 2.6.8
 
 # some of ruby's build scripts are written in ruby
 #   we purge system ruby later to make sure our final image uses what we just built

2.2/slim/Dockerfile

@@ -22,7 +22,7 @@ RUN mkdir -p /usr/local/etc \
 ENV RUBY_MAJOR 2.2
 ENV RUBY_VERSION 2.2.5
 ENV RUBY_DOWNLOAD_SHA256 30c4b31697a4ca4ea0c8db8ad30cf45e6690a0f09687e5d483c933c03ca335e3
-ENV RUBYGEMS_VERSION 2.6.7
+ENV RUBYGEMS_VERSION 2.6.8
 
 # some of ruby's build scripts are written in ruby
 #   we purge system ruby later to make sure our final image uses what we just built