fix: resolve cookie header merging and align shrinkwrap with CI npm version

Author: joehan

npm-shrinkwrap.json

@@ -10,6 +10,12 @@ global.Headers = nodeFetch.Headers;
 global.Request = nodeFetch.Request;
 global.Response = nodeFetch.Response;
 
+if (typeof nodeFetch.Headers.prototype.getSetCookie !== "function") {
+  nodeFetch.Headers.prototype.getSetCookie = function() {
+    return this.raw()["set-cookie"] || [];
+  };
+}
+
 // Force nock to execute its side-effects (patching http/https) immediately on load
 void nock;