build: Bump isolated-vm to 6.1.2 (#30519)

Co-authored-by: Claude Opus 4.7 (1M context) <[email protected]>

docker/images/n8n/Dockerfile

@@ -1,13 +1,12 @@
 ARG NODE_VERSION=24.15.0
 ARG N8N_VERSION=snapshot
 
-# Rebuild native addons for the container platform. The base image has no
-# package manager or build tools, so we compile in a throwaway builder stage.
+# Builder stage exists because the runtime base image has no toolchain.
 FROM node:${NODE_VERSION}-alpine3.23 AS builder
 COPY ./compiled /usr/local/lib/node_modules/n8n
 RUN apk add --no-cache python3 make g++ && \
     cd /usr/local/lib/node_modules/n8n && \
-    npm rebuild sqlite3 isolated-vm
+    npm rebuild sqlite3
 
 FROM n8nio/base:${NODE_VERSION}