chore(deps): update dependency cross-env to v6 (#760)

Author: renovate-bot

package.json

@@ -78,7 +78,7 @@
     "@types/semver": "^6.0.0",
     "@types/uuid": "^3.4.4",
     "codecov": "^3.0.4",
-    "cross-env": "^5.2.0",
+    "cross-env": "^6.0.0",
     "gts": "^1.0.0",
     "intelli-espower-loader": "^1.0.1",
     "js-green-licenses": "^1.0.0",