Bump node from 11.15.0-alpine to 18.9.0-alpine in /client-report (com…

…pdemocracy#1525)

Bumps node from 11.15.0-alpine to 18.9.0-alpine.

---
updated-dependencies:
- dependency-name: node
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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client-report/Dockerfile

@@ -1,5 +1,5 @@
 # Gulp v3 stops us from upgrading beyond Node v11
-FROM docker.io/node:11.15.0-alpine
+FROM docker.io/node:18.9.0-alpine
 
 WORKDIR /app