Allow for 1 retry

Author: jtpio

ui-tests/playwright.config.js

@@ -3,5 +3,5 @@ const baseConfig = require('@jupyterlab/galata/lib/playwright-config');
 module.exports = {
   ...baseConfig,
   timeout: 240000,
-  retries: 0,
+  retries: 1,
 };