Update vuejs dependencies

Signed-off-by: Guillaume Lours <guillaume.lours@docker.com>

vuejs/vuejs/Dockerfile

@@ -1,11 +1,11 @@
-FROM node:13.10.1-alpine
+FROM node:14.4.0-alpine
 
 RUN mkdir /project
 WORKDIR /project
 
 COPY . .
 
-RUN npm install -g @vue/cli
+RUN yarn global add @vue/cli
 RUN yarn install
 ENV HOST=0.0.0.0
 CMD ["yarn", "run", "serve"]