Update H2O (#5031)

Also update the Ruby version used by h2o_mruby.

frameworks/C/h2o/h2o.dockerfile

@@ -19,7 +19,7 @@ RUN git clone "https://github.com/x86-64/mustache-c.git" "$MUSTACHE_C_BUILD_DIR"
 
 ### Install h2o
 
-ENV H2O_VERSION=2.2.5
+ENV H2O_VERSION=2.2.6
 ENV H2O_ARCHIVE="v${H2O_VERSION}.tar.gz"
 ENV H2O_PREFIX=/opt/h2o
 

frameworks/PHP/php/php-h2o.dockerfile

@@ -18,7 +18,7 @@ RUN if [ $(nproc) = 2 ]; then sed -i "s|pm.max_children = 1024|pm.max_children =
 
 ### Install h2o
 
-ENV H2O_VERSION=2.2.5
+ENV H2O_VERSION=2.2.6
 ENV H2O_ARCHIVE="v${H2O_VERSION}.tar.gz"
 ENV H2O_HOME=/h2o
 

frameworks/Ruby/h2o_mruby/h2o_mruby.dockerfile

@@ -1,10 +1,10 @@
-FROM ruby:2.4
+FROM ruby:2.6
 
 ADD ./h2o.conf ./
 
 RUN apt update && apt install -yqq bison cmake libssl-dev make
 
-ENV H2O_VERSION=2.3.0-beta1
+ENV H2O_VERSION=2.3.0-beta2
 ENV H2O_ARCHIVE="v${H2O_VERSION}.tar.gz"
 ENV H2O_HOME=/h2o