chore(docker) bump libyaml from 0.2.1 to 0.2.3 (#262)

### Summary

#### libyaml 0.2.2 release

- #95 -- build: do not install config.h
- #97 -- appveyor.yml: fix Release build
- #103 -- Remove unused code in yaml_document_delete
- #104 -- Allow colons in plain scalars inside flow collections
- #109 -- Fix comparison in tests/run-emitter.c
- #117 -- Fix typo error
- #119 -- The closing single quote needs to be indented...
- #121 -- fix token name typos in comments
- #122 -- Revert removing of open_ended after top level plain scalar
- #125 -- Cherry-picks from PR 27
- #135 -- Windows/C89 compatibility
- #136 -- allow override of Windows static lib name

#### libyaml 0.2.3 release

- #130 Fixed typo.
- #144 Fix typo in comment
- #140 Use pointer to const for strings that aren't/shouldn't be modified
- #128 Squash a couple of warnings in example-deconstructor-alt
- #151 Fix spelling for error message
- #161 Make appveyor config be a hidden file
- #159 Add CHANGES file
- #160 Always output document end before directive (YAML 1.2 compatibility)
- #162 Output document end marker after open ended scalars
- #157 change cmake target name from libOFF.a to libyaml.a
- #155 include/yaml.h: fix comments
- #169 Fixed missing token in example
- #127 Avoid recursion in the document loader.
- #172 Support %YAML 1.2 directives
- #66 Change dllexport controlling macro to use _WIN32

Makefile

@@ -36,7 +36,7 @@ RESTY_PCRE_VERSION ?= `grep RESTY_PCRE_VERSION $(KONG_SOURCE_LOCATION)/.requirem
 KONG_GMP_VERSION ?= `grep KONG_GMP_VERSION $(KONG_SOURCE_LOCATION)/.requirements | awk -F"=" '{print $$2}'`
 KONG_NETTLE_VERSION ?= `grep KONG_NETTLE_VERSION $(KONG_SOURCE_LOCATION)/.requirements | awk -F"=" '{print $$2}'`
 OPENRESTY_PATCHES ?= 1
-LIBYAML_VERSION ?= 0.2.1
+LIBYAML_VERSION ?= 0.2.3
 DOCKER_KONG_VERSION ?= master
 DEBUG ?= 0
 
@@ -278,7 +278,7 @@ ifneq ($(RESTY_IMAGE_BASE),src)
 	-t $(DOCKER_REPOSITORY):test-$(DOCKER_TEST_SUFFIX) .
 	docker tag $(DOCKER_REPOSITORY):test-$(DOCKER_TEST_SUFFIX) $(DOCKER_REPOSITORY):test
 	docker tag $(DOCKER_REPOSITORY):test-$(DOCKER_TEST_SUFFIX) $(DOCKER_REPOSITORY):test-$(DOCKER_OPENRESTY_SUFFIX)
-	
+
 	-$(UPDATE_CACHE_COMMAND) $(DOCKER_REPOSITORY):test-$(DOCKER_OPENRESTY_SUFFIX)
 endif
 

dockerfiles/Dockerfile.openresty

@@ -8,7 +8,7 @@ FROM ${DOCKER_REPOSITORY}:${RESTY_IMAGE_BASE}-${RESTY_IMAGE_TAG}-${DOCKER_BASE_S
 ARG EDITION="community"
 ENV EDITION $EDITION
 
-ARG LIBYAML_VERSION=0.2.1
+ARG LIBYAML_VERSION=0.2.3
 ENV LIBYAML_VERSION $LIBYAML_VERSION
 RUN curl -fsSLo /tmp/yaml-${LIBYAML_VERSION}.tar.gz https://pyyaml.org/download/libyaml/yaml-${LIBYAML_VERSION}.tar.gz \
     && cd /tmp \