fix: frontend/dynatrace.Dockerfile to reduce vulnerabilities (#1119)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN12-GLIBC-1547196
- https://snyk.io/vuln/SNYK-DEBIAN12-GLIBC-1547196
- https://snyk.io/vuln/SNYK-DEBIAN12-PERL-5489184
- https://snyk.io/vuln/SNYK-DEBIAN12-TAR-1560620
- https://snyk.io/vuln/SNYK-DEBIAN12-ZLIB-6008963

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

frontend/dynatrace.Dockerfile

@@ -2,15 +2,15 @@ ARG DYNATRACE_PAAS_TOKEN
 ARG DYNATRACE_TENANT
 ARG DYNATRACE_URL
 FROM ${DYNATRACE_URL}/e/${DYNATRACE_TENANT}/linux/oneagent-codemodules:all as dynatrace_repo
-FROM node:lts-slim as build
+FROM node:20.12.2-slim as build
 
 WORKDIR /app
 
 COPY package.json package-lock.json tsconfig.json ./
 RUN npm install
 COPY . .
 
-FROM node:lts-slim
+FROM node:20.12.2-slim
 WORKDIR /app
 COPY --from=build /app ./