Update Yarn to version 1.3.2 (#5900)

Dockerfile

@@ -7,8 +7,8 @@ ENV UID=991 GID=991 \
     RAILS_SERVE_STATIC_FILES=true \
     RAILS_ENV=production NODE_ENV=production
 
-ARG YARN_VERSION=1.1.0
-ARG YARN_DOWNLOAD_SHA256=171c1f9ee93c488c0d774ac6e9c72649047c3f896277d88d0f805266519430f3
+ARG YARN_VERSION=1.3.2
+ARG YARN_DOWNLOAD_SHA256=6cfe82e530ef0837212f13e45c1565ba53f5199eec2527b85ecbcd88bf26821d
 ARG LIBICONV_VERSION=1.15
 ARG LIBICONV_DOWNLOAD_SHA256=ccf536620a45458d26ba83887a983b96827001e92a13847b45e4925cc8913178