fix: use 20.8.1 instead of 20.9.0 for bullseye slim image

ops/docker/Dockerfile.packages

@@ -35,7 +35,7 @@ FROM us-docker.pkg.dev/oplabs-tools-artifacts/images/ci-builder:latest as foundr
 # we use it rather than alpine because it's not much
 # bigger and alpine is often missing packages for node applications
 # alpine is not officially supported by node.js
-FROM node:20.9.0-bullseye-slim as base
+FROM node:20.8.1-bullseye-slim as base
 
 # Base: install deps
 RUN apt-get update && apt-get install -y \