Update base image tag from alpine 3.18.2 --> alpine 3.18.4
Issue: Alpine Linux 3.18.2 is EOL.
Link to VAT: https://vat.dso.mil/vat/image?imageName=opensource/nodejs/nodejs18&tag=18.18.2-slim&branch=master
Fix: Looks like the Dockerfile and hardening_manifest.yaml need to be bumped to 3.18.4. I don't believe my account currently has permission to create a branch or merge request in this repository so I'm creating an issue for tracking instead.
Thanks in advance!