build(deps-dev): bump react-burger-menu in /unison-ui (#236)

Bumps [react-burger-menu](https://github.com/negomi/react-burger-menu) from 2.8.0 to 2.9.0.
- [Release notes](https://github.com/negomi/react-burger-menu/releases)
- [Commits](negomi/react-burger-menu@v2.8.0...v2.9.0)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

unison-ui/package.json

@@ -54,7 +54,7 @@
     "postcss-preset-env": "^6.3.0",
     "postcss-simple-vars": "^5.0.2",
     "postcss-url": "^8.0.0",
-    "react-burger-menu": "^2.8.0",
+    "react-burger-menu": "^2.9.0",
     "react-feather": "^2.0.8",
     "react-syntax-highlighter": "^15.0.1",
     "rimraf": "^3.0.1",