fix: Update custom config file parse error (#26914)

lib/workers/global/config/parse/file.ts

@@ -73,7 +73,7 @@ export async function getConfig(env: NodeJS.ProcessEnv): Promise<AllConfig> {
       logger.fatal(err.message);
       process.exit(1);
     } else if (env.RENOVATE_CONFIG_FILE) {
-      logger.fatal('No custom config file found on disk');
+      logger.fatal('Error parsing config file');
       process.exit(1);
     }
     // istanbul ignore next: we can ignore this