fix(deps): bump swagger-client to v3.14.1 (#7440)

This sets minimum Node.js version to >=12.4 and
fixes problem with swagger-ui.js build fragment.

Refs #7436

package.json

@@ -91,7 +91,7 @@
     "reselect": "^4.0.0",
     "serialize-error": "^8.1.0",
     "sha.js": "^2.4.11",
-    "swagger-client": "^3.13.5",
+    "swagger-client": "=3.14.1",
     "url-parse": "^1.5.1",
     "xml-but-prettier": "^1.0.1",
     "zenscroll": "^4.0.2"