fix(core): add missing vue-flow__container class to marker defs (#1833)

.changeset/happy-ghosts-drum.md

@@ -0,0 +1,5 @@
+---
+"@vue-flow/core": patch
+---
+
+Add missing vue-flow\_\_container class to marker defs.

packages/core/src/container/EdgeRenderer/MarkerDefinitions.vue

@@ -49,7 +49,7 @@ export default {
 </script>
 
 <template>
-  <svg class="vue-flow__marker" aria-hidden="true">
+  <svg class="vue-flow__marker vue-flow__container" aria-hidden="true">
     <defs>
       <MarkerSymbols
         v-for="marker of markers"