Bump node from 18-alpine to 20-alpine in /frontend (#7638)

* Bump node from 18-alpine to 22-alpine in /frontend

Bumps node from 18-alpine to 22-alpine.

---
updated-dependencies:
- dependency-name: node
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

* pin frontend docker file to node 20

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Bob Zhao <[email protected]>

frontend/Dockerfile

@@ -49,7 +49,7 @@ RUN echo "REACT_APP_CONTENT_SECURITY_POLICY_SCRIPT_SRC=''" >> .env.production.lo
 RUN yarn run build
 
 # production environment
-FROM node:18-alpine
+FROM node:20-alpine
 RUN npm install -g serve
 WORKDIR /app/frontend
 COPY --from=build /app/frontend/build /app/frontend/build