fix: remediate high-severity CVEs in Docker images

- Add apk upgrade to frontend Dockerfile (build + prod stages)
- Add apk upgrade to auth Dockerfile (build + runtime stages)
- Add apt-get upgrade to api Dockerfile (build + prod stages)
- Add apt-get upgrade to receiptwitness Dockerfile (build + prod stages)
- Run npm audit fix for frontend and auth dependencies

Refs: CAR-616
Co-Authored-By: Paperclip <noreply@paperclip.ing>

Dockerfile

@@ -1,4 +1,5 @@
 FROM node:22-alpine AS builder
+RUN apk update && apk upgrade --no-cache
 WORKDIR /app
 COPY package.json package-lock.json* ./
 RUN npm ci
@@ -7,6 +8,7 @@ COPY src/ src/
 RUN npm run build
 
 FROM node:22-alpine
+RUN apk update && apk upgrade --no-cache
 WORKDIR /app
 ENV NODE_ENV=production
 COPY package.json package-lock.json* ./