Bump vue-select from 4.0.0-beta.2 to 4.0.0-beta.6 in /ui

Bumps [vue-select](https://github.com/sagalbot/vue-select) from 4.0.0-beta.2 to 4.0.0-beta.6.
- [Release notes](https://github.com/sagalbot/vue-select/releases)
- [Changelog](https://github.com/sagalbot/vue-select/blob/master/release.config.js)
- [Commits](sagalbot/vue-select@v4.0.0-beta.2...v4.0.0-beta.6)

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

Signed-off-by: dependabot[bot] <support@github.com>

ui/package.json

@@ -22,7 +22,7 @@
     "vue": "^3.4.35",
     "vue-chartist": "^3.0.0",
     "vue-router": "^4.4.0",
-    "vue-select": "4.0.0-beta.2",
+    "vue-select": "4.0.0-beta.6",
     "webpack": "^5.93.0"
   },
   "devDependencies": {