build(deps-dev): bump @duckduckgo/design-tokens from v0.30.0 to v0.31.0

Bumps [@duckduckgo/design-tokens](https://github.com/duckduckgo/design-tokens) from v0.30.0 to v0.31.0.
- [Release notes](https://github.com/duckduckgo/design-tokens/releases)
- [Commits](duckduckgo/design-tokens@f7ecae7...2c1a2da)

---
updated-dependencies:
- dependency-name: "@duckduckgo/design-tokens"
  dependency-version: 2c1a2daf6ab6876ed3e40c6a87f9edfd17663472
  dependency-type: direct:development
...

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

Author: dependabot[bot]

package-lock.json

@@ -28,7 +28,7 @@
   },
   "license": "ISC",
   "devDependencies": {
-    "@duckduckgo/design-tokens": "github:duckduckgo/design-tokens#v0.30.0",
+    "@duckduckgo/design-tokens": "github:duckduckgo/design-tokens#v0.31.0",
     "@duckduckgo/messaging": "*",
     "chokidar": "^5.0.0",
     "fast-check": "^4.9.0",