test(cookies): use test "httpsAgent" for self-signed certs

test/node/rest-api/cookies-inheritance.node.test.ts

@@ -4,7 +4,7 @@
 import fetch from 'node-fetch'
 import { HttpResponse, http } from 'msw'
 import { setupServer, SetupServer } from 'msw/node'
-import { HttpServer } from '@open-draft/test-server/http'
+import { HttpServer, httpsAgent } from '@open-draft/test-server/http'
 import { RequestHandler as ExpressRequestHandler } from 'express'
 
 let server: SetupServer
@@ -60,6 +60,7 @@ afterAll(async () => {
 test('inherits cookies set from a preceeding request', async () => {
   const res = await fetch(httpServer.https.url('/login'), {
     method: 'POST',
+    agent: httpsAgent,
   }).then(() => {
     // Fetch the user after requesting login to see
     // if the response cookies set in the login request handler