Update dependency lerna to v5

Author: renovate[bot]

package.json

@@ -33,7 +33,7 @@
     "@deloitte-digital-au/eslint-config": "^3.4.0",
     "@deloitte-digital-au/stylelint-config": "^2.0.0",
     "cypress": "^3.2.0",
-    "lerna": "^3.0.0",
+    "lerna": "^5.0.0",
     "mocha": "^6.1.2",
     "npm-run-all": "^4.1.3",
     "rimraf": "^2.6.2",