Bump vue-echarts from 6.6.8 to 6.6.9 in /ui

Bumps [vue-echarts](https://github.com/ecomfe/vue-echarts) from 6.6.8 to 6.6.9.
- [Release notes](https://github.com/ecomfe/vue-echarts/releases)
- [Changelog](https://github.com/ecomfe/vue-echarts/blob/main/CHANGELOG.md)
- [Commits](ecomfe/vue-echarts@v6.6.8...v6.6.9)

---
updated-dependencies:
- dependency-name: vue-echarts
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

ui/package.json

@@ -63,7 +63,7 @@
     "stompjs": "2.3.3",
     "vue": "3.4.20",
     "vue-clipboard3": "2.0.0",
-    "vue-echarts": "6.6.8",
+    "vue-echarts": "6.6.9",
     "vue-router": "4.2.5"
   },
   "devDependencies": {