[docker] Bump node from 20.9.0-alpine3.18 to 21.7.2-alpine3.18

Bumps node from 20.9.0-alpine3.18 to 21.7.2-alpine3.18.

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

Signed-off-by: dependabot[bot] <support@github.com>

Dockerfile

@@ -1,5 +1,5 @@
 # Step 1: Build the app with node
-FROM node:20.9.0-alpine3.18 AS builder
+FROM node:21.7.2-alpine3.18 AS builder
 WORKDIR /app
 COPY package*.json .
 RUN npm ci

Dockerfile.node

@@ -1,12 +1,12 @@
-FROM node:20.9.0-alpine3.18 AS builder
+FROM node:21.7.2-alpine3.18 AS builder
 WORKDIR /app
 COPY package*.json .
 RUN npm ci
 COPY . .
 RUN npm run build
 RUN npm ci --omit dev
 
-FROM node:20.9.0-alpine3.18
+FROM node:21.7.2-alpine3.18
 WORKDIR /app
 COPY --from=builder /app/build build/
 COPY --from=builder /app/node_modules node_modules/