Bump concurrently from 5.3.0 to 6.0.0 (#3438)

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

package.json

@@ -139,7 +139,7 @@
     "browser-sync": "^2.26.14",
     "bundlewatch": "^0.3.2",
     "clean-css-cli": "^4.3.0",
-    "concurrently": "^5.3.0",
+    "concurrently": "^6.0.0",
     "eslint": "^7.20.0",
     "eslint-config-xo": "^0.34.0",
     "eslint-plugin-compat": "^3.9.0",