Chore(deps): Bump @nextcloud/vue from 8.19.0 to 8.21.0

Bumps [@nextcloud/vue](https://github.com/nextcloud-libraries/nextcloud-vue) from 8.19.0 to 8.21.0.
- [Release notes](https://github.com/nextcloud-libraries/nextcloud-vue/releases)
- [Changelog](https://github.com/nextcloud-libraries/nextcloud-vue/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nextcloud-libraries/nextcloud-vue/compare/v8.19.0...v8.21.0)

---
updated-dependencies:
- dependency-name: "@nextcloud/vue"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -43,7 +43,7 @@
     "@nextcloud/moment": "^1.3.1",
     "@nextcloud/notify_push": "^1.3.0",
     "@nextcloud/router": "^3.0.1",
-    "@nextcloud/vue": "^8.19.0",
+    "@nextcloud/vue": "^8.21.0",
     "blueimp-md5": "^2.19.0",
     "chroma-js": "^3.1.2",
     "dompurify": "^3.2.0",