chore(deps): update node.js to v18 (#120)

renovate[bot] · renovate-bot · web-flow · commit b12f3e69c4e8 · 2022-08-09T11:33:08.000+02:00
Co-authored-by: Renovate Bot &lt;bot@renovateapp.com&gt;
diff --git a/Dockerfile b/Dockerfile
@@ -1,4 +1,4 @@
-ARG NODE_VERSION=8
+ARG NODE_VERSION=18
 FROM node:${NODE_VERSION}
 
 WORKDIR /app
