Update Playwright to 1.56.1 for security fixes

Author: mraible

e2e/package-lock.json

@@ -19,7 +19,7 @@
     "otpauth": "9.4.1"
   },
   "devDependencies": {
-    "@playwright/test": "1.55.0",
+    "@playwright/test": "1.56.1",
     "@types/node": "24.4.0"
   }
 }