Bump concurrently from 5.3.0 to 6.0.0 (#4646)

Bumps [concurrently](https://github.com/kimmobrunfeldt/concurrently) from 5.3.0 to 6.0.0.
- [Release notes](https://github.com/kimmobrunfeldt/concurrently/releases)
- [Commits](https://github.com/kimmobrunfeldt/concurrently/compare/v5.3.0...v6.0.0)

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package.json

@@ -66,7 +66,7 @@
     "babel-eslint": "^10.1.0",
     "chai": "^4.2.0",
     "clang-format": "^1.5.0",
-    "concurrently": "^5.3.0",
+    "concurrently": "^6.0.0",
     "eslint": "^7.6.0",
     "eslint-plugin-es5": "^1.5.0",
     "google-closure-compiler": "^20210106.0.0",