MC-1730 Fix flowchart subgraph id isue

packages/mermaid/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@mermaid-chart/mermaid",
-  "version": "11.0.0-b.44",
+  "version": "11.0.0-b.45",
   "description": "Markdown-ish syntax for generating flowcharts, sequence diagrams, class diagrams, gantt charts and git graphs.",
   "type": "module",
   "module": "./dist/mermaid.core.mjs",

packages/mermaid/src/rendering-util/rendering-elements/clusters.js

@@ -26,6 +26,7 @@ const rect = async (parent, node) => {
     .insert('g')
     .attr('class', 'cluster ' + node.cssClasses)
     .attr('id', node.id)
+    .attr('data-id', node.id)
     .attr('data-et', 'cluster')
     .attr('data-look', node.look);