Update Dockerfile node version

Dockerfile

@@ -1,13 +1,13 @@
-FROM node:17 AS BUILD_IMAGE
+FROM node:16 AS BUILD_IMAGE
 RUN curl -sfL https://install.goreleaser.com/github.com/tj/node-prune.sh | bash -s -- -b /usr/local/bin
 WORKDIR /build
 COPY . .
 RUN npm ci && npm run build
 RUN npm prune --production
 RUN /usr/local/bin/node-prune
 
-FROM node:17-alpine
+FROM node:16-alpine
 WORKDIR /usr/src/pow-shield
 COPY --from=BUILD_IMAGE /build/dist .
 COPY --from=BUILD_IMAGE /build/node_modules ./node_modules
-CMD [ "node", "bin/server.js" ]
+CMD [ "node", "bin/server.js" ]