Update H2O to version 2.2.5 (#4159)

frameworks/C/h2o/h2o.dockerfile

@@ -21,7 +21,7 @@ ENV LD_LIBRARY_PATH="${MUSTACHE_C_HOME}/lib:$LD_LIBRARY_PATH"
 
 ### Install h2o
 
-ENV H2O_VERSION=2.2.4
+ENV H2O_VERSION=2.2.5
 ENV H2O_ARCHIVE="v${H2O_VERSION}.tar.gz"
 ENV H2O_HOME=/h2o