WIP temporarily use node-fetch as nock cannot intercept native fetch requests yet

Author: gr2m

lib/get-client.js

@@ -1,6 +1,7 @@
 import urljoin from "url-join";
 import { HttpProxyAgent } from "http-proxy-agent";
 import { HttpsProxyAgent } from "https-proxy-agent";
+import nodeFetch from "node-fetch";
 
 import SemanticReleaseOctokit from "./semantic-release-octokit.js";
 
@@ -15,6 +16,10 @@ export default function getClient({
     auth: `token ${githubToken}`,
     baseUrl,
     request: {
+      // TODO: we temporary use use `node-fetch` because `nock` does not support
+      // mocking Node's native fetch yet. The plan is to replace nock with `fetch-mock`
+      // before merging this PR.
+      fetch: nodeFetch,
       agent: proxy
         ? baseUrl && new URL(baseUrl).protocol.replace(":", "") === "http"
           ? // Some `proxy.headers` need to be passed as second arguments since version 6 or 7