build(deps): bump @vector-im/compound-design-tokens in /frontend

Bumps [@vector-im/compound-design-tokens](https://github.com/element-hq/compound-design-tokens) from 6.0.0 to 6.4.0.
- [Release notes](https://github.com/element-hq/compound-design-tokens/releases)
- [Changelog](https://github.com/element-hq/compound-design-tokens/blob/main/docs/release.md)
- [Commits](element-hq/compound-design-tokens@v6.0.0...v6.4.0)

---
updated-dependencies:
- dependency-name: "@vector-im/compound-design-tokens"
  dependency-version: 6.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -24,7 +24,7 @@
     "@radix-ui/react-dialog": "^1.1.15",
     "@tanstack/react-query": "^5.90.10",
     "@tanstack/react-router": "^1.131.44",
-    "@vector-im/compound-design-tokens": "6.0.0",
+    "@vector-im/compound-design-tokens": "6.4.0",
     "@vector-im/compound-web": "^8.2.4",
     "@zxcvbn-ts/core": "^3.0.4",
     "@zxcvbn-ts/language-common": "^3.0.4",