Bump concurrently from 6.2.1 to 6.4.0 (#7367)

Bumps [concurrently](https://github.com/open-cli-tools/concurrently) from 6.2.1 to 6.4.0.
- [Release notes](https://github.com/open-cli-tools/concurrently/releases)
- [Commits](https://github.com/open-cli-tools/concurrently/compare/v6.2.1...v6.4.0)

---
updated-dependencies:
- dependency-name: concurrently
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

package.json

@@ -133,7 +133,7 @@
     "ajv-cli": "^4.2.0",
     "codelyzer": "^6.0.1",
     "commander": "6.2.1",
-    "concurrently": "^6.2.1",
+    "concurrently": "^6.4.0",
     "cspell": "^5.5.1",
     "css-loader": "^5.2.6",
     "dotenv": "^8.2.0",