Allow anonymous GitHub usage without GITHUB_TOKEN env variable (#2670)

In case the env var isn't present (like in a Netlify deploy without
sensitive variables), this makes sure that "auth" is undefined rather than
an invalid empty string.

Signed-off-by: Julius Volz <julius.volz@gmail.com>

scripts/githubClient.ts

@@ -4,5 +4,5 @@ import { Octokit } from "octokit";
 dotenv.config();
 
 export const octokit = new Octokit({
-  auth: `${process.env.GITHUB_TOKEN}`,
+  auth: process.env.GITHUB_TOKEN,
 });