fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-LODASH-1018905
- https://snyk.io/vuln/SNYK-JS-LODASH-1040724

Author: snyk-bot

package.json

@@ -43,7 +43,7 @@
     "js-yaml": "^3.13.1",
     "json-diff": "^0.5.4",
     "json-format": "^1.0.1",
-    "lodash": "^4.17.20",
+    "lodash": "^4.17.21",
     "node-fetch": "^2.6.0",
     "swagger-client": "^3.9.6",
     "webpack": "^4.41.2"