fix: package.json & package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-HANDLEBARS-534988

Author: snyk-bot

package-lock.json

@@ -76,7 +76,7 @@
     "get-folder-size": "^2.0.0",
     "glob": "^7.1.1",
     "global-tunnel-ng": "^2.1.0",
-    "handlebars": "^4.3.3",
+    "handlebars": "^4.5.3",
     "http-proxy-middleware": "^0.18.0",
     "inquirer": "^1.0.2",
     "into-stream": "^5.0.0",