Merge pull request #377 from hedgedoc/renovate/node-16.18.1-alpine

Update Node.js to b9e3244

alpine/Dockerfile

-FROM node:16.18.1-alpine@sha256:296dd8ebd5b68706cc35d85e3c5b0103b28d2c0e8fde7e2feff68e4072636d6a AS base
+FROM node:16.18.1-alpine@sha256:b9e3244a692a1e4fea97938e073a6563ebd88b88cb0c033bf9719c2bc1e79b58 AS base
 
 FROM base AS builder
 # Build arguments to change source url, branch or tag