chore: roll stable test runner to 1.61.0-beta-1781285686000 (microsoft#41276)

Author: dgozman

tests/playwright-test/stable-test-runner/package-lock.json

@@ -1,6 +1,6 @@
 {
   "private": true,
   "dependencies": {
-    "@playwright/test": "^1.61.0-alpha-1781023400000"
+    "@playwright/test": "^1.61.0-beta-1781285686000"
   }
 }