Use getOctokit(...) when getting the GitHub API client.

src/api-client.ts

@@ -1,4 +1,4 @@
-import * as github from "@actions/github/lib/utils";
+import * as github from "@actions/github";
 import consoleLogLevel from "console-log-level";
 import * as path from "path";
 
@@ -13,8 +13,7 @@ export const getApiClient = function (
   if (isLocalRun() && !allowLocalRun) {
     throw new Error("Invalid API call in local run");
   }
-  return new github.GitHub({
-    auth: githubAuth,
+  return github.getOctokit(githubAuth, {
     baseUrl: getApiUrl(githubUrl),
     userAgent: "CodeQL Action",
     log: consoleLogLevel({ level: "debug" }),