chore(lerna): upgrades lerna to 6.x (#3215)

* feat(core): upgrades lerna to 6.x.x

* feat(core): upgrades lerna to 6.5.1

* feat(core): updates lerna to 6.x.x

* feat(core): updates default config

package.json

@@ -109,7 +109,7 @@
     "jest": "^24.8.0",
     "jest-canvas-mock": "^2.1.0",
     "jest-junit": "^6.4.0",
-    "lerna": "^3.15.0",
+    "lerna": "^6.5.1",
     "lint-staged": "^9.0.2",
     "mini-css-extract-plugin": "^2.1.0",
     "optimize-css-assets-webpack-plugin": "^5.0.3",