build(deps): bump webdav from 5.8.0 to 5.9.0 in /build/frontend-legacy

Bumps [webdav](https://github.com/perry-mitchell/webdav-client) from 5.8.0 to 5.9.0.
- [Changelog](https://github.com/perry-mitchell/webdav-client/blob/master/CHANGELOG.md)
- [Commits](perry-mitchell/webdav-client@v5.8.0...v5.9.0)

---
updated-dependencies:
- dependency-name: webdav
  dependency-version: 5.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

build/frontend-legacy/package-lock.json

@@ -101,7 +101,7 @@
     "vuedraggable": "^2.24.3",
     "vuex": "^3.6.2",
     "vuex-router-sync": "^5.0.0",
-    "webdav": "^5.8.0"
+    "webdav": "^5.9.0"
   },
   "devDependencies": {
     "@babel/node": "^7.28.6",