Update npm version for ow-utils docker (#5261)

Author: hugy718

tools/ow-utils/Dockerfile

@@ -35,6 +35,9 @@ RUN apt-get update && apt-get install -y \
   locales \
 && rm -rf /var/lib/apt/lists/*
 
+# update npm
+RUN npm install -g n && n stable && hash -r
+
 RUN locale-gen en_US.UTF-8
 ENV LANG='en_US.UTF-8' LANGUAGE='en_US:en' LC_ALL='en_US.UTF-8'