Update dependency concurrently to v5

Author: renovate-bot

package.json

@@ -147,7 +147,7 @@
     "@sourcegraph/tsconfig": "^4.0.0",
     "@sourcegraph/tslint-config": "^12.3.1",
     "@types/mkdirp-promise": "5.0.0",
-    "concurrently": "^4.1.0",
+    "concurrently": "^5.0.1",
     "lnfs-cli": "^2.1.0",
     "mkdirp-promise": "^5.0.1",
     "parcel-bundler": "^1.11.0",