Update Ruby

Dockerfile.bullseye

@@ -26,8 +26,8 @@ RUN set -eux; \
 
 ENV LANG C.UTF-8
 ENV RUBY_MAJOR 2.7
-ENV RUBY_VERSION 2.7.2
-ENV RUBY_DOWNLOAD_SHA256 1b95ab193cc8f5b5e59d2686cb3d5dcf1ddf2a86cb6950e0b4bdaae5040ec0d6
+ENV RUBY_VERSION 2.7.3
+ENV RUBY_DOWNLOAD_SHA256 5e91d1650857d43cd6852e05ac54683351e9c301811ee0bef43a67c4605e7db1
 
 # 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
@@ -115,6 +115,10 @@ RUN mkdir -p "$GEM_HOME" && chmod 777 "$GEM_HOME"
 
 CMD [ "irb" ]
 
+#######################################################################################################################
+
+# https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/fluentd-elasticsearch/fluentd-es-image/Dockerfile
+
 # Copyright 2017 The Kubernetes Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");