Fix linting errors

apps/api/src/controllers/Oauth/Github.ts

@@ -33,7 +33,7 @@ export class Github {
 
   @Get('callback')
   @CatchAsync
-  public async callback(req: Request, res: Response, next: NextFunction) {
+  public async callback(req: Request, res: Response, _next: NextFunction) {
     if (!GITHUB_OAUTH_ENABLED) {
       return res.status(404).json({error: 'GitHub OAuth is not configured'});
     }