feat: use fetch with trusted certificates for oidc (#2412)

* feat: use fetch with trusted certificates for oidc

* fix: change custom-fetch symbol from auth-core to next-auth

* test: add mock for next-auth in events test

* refactor: use package import instead of relative import

packages/auth/test/events.spec.ts

@@ -11,6 +11,7 @@ import { colorSchemeCookieKey, everyoneGroup } from "@homarr/definitions";
 
 import { createSignInEventHandler } from "../events";
 
+vi.mock("next-auth", () => ({}));
 vi.mock("../env", () => {
   return {
     env: {