Bump node from 18.11.0-slim to 18.12.0-slim in /src (#699)

Bumps node from 18.11.0-slim to 18.12.0-slim.

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

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src/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:18.11.0-slim
+FROM node:18.12.0-slim
 WORKDIR /usr/app
 
 COPY package*.json ./