fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN11-GLIBC-5927133
- https://snyk.io/vuln/SNYK-DEBIAN11-GLIBC-5927133
- https://snyk.io/vuln/SNYK-DEBIAN11-NCURSES-5421197
- https://snyk.io/vuln/SNYK-UPSTREAM-NODE-5969351
- https://snyk.io/vuln/SNYK-UPSTREAM-NODE-5969352

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:20.6-bullseye-slim
+FROM node:20.11.1-bullseye-slim
 WORKDIR /app
 COPY package*.json ./
 COPY pm2.test.config.js ./pm2.config.js