fix(security): depend on min version of lodash >= 4.17.21

This fixes security vulnerability in older version of lodash.

Vuln URL: https://snyk.io/vuln/SNYK-JS-LODASH-1018905

Refs swagger-api/swagger-ui#7473

Author: char0n

.npmrc

@@ -1 +1 @@
-audit-whitelist=[1751]
+audit-whitelist=[]

package.json

@@ -117,7 +117,7 @@
     "form-data-encoder": "^1.4.3",
     "formdata-node": "^4.0.0",
     "js-yaml": "^4.1.0",
-    "lodash": "^4.17.19",
+    "lodash": "^4.17.21",
     "qs": "^6.9.4",
     "querystring-browser": "^1.0.4",
     "traverse": "~0.6.6",