test(resolver): fix node deprecation warning DEP0066 (#1539)

When running tests, deprecation warning DEP0066 was triggering warning.
Problem was resolved by updating nock library to newest versions
that no longer uses node deprecated API.

https://nodejs.org/api/deprecations.html#deprecations_dep0066_outgoingmessage_prototype_headers_outgoingmessage_prototype_headernames

Author: char0n

package-lock.json

@@ -84,7 +84,7 @@
     "jest": "^24.8.0",
     "json-loader": "^0.5.4",
     "license-checker": "^8.0.3",
-    "nock": "^10.0.6",
+    "nock": "^12.0.3",
     "npm-audit-ci-wrapper": "^2.3.0",
     "npm-run-all": "^4.1.3",
     "release-it": "^12.3.3",