chore(deps): update dependency puppeteer to v21 (#3376)

Author: renovate-bot

appengine/websockets/package.json

@@ -23,6 +23,6 @@
   "devDependencies": {
     "c8": "^8.0.0",
     "mocha": "^10.0.0",
-    "puppeteer": "^20.0.0"
+    "puppeteer": "^21.0.0"
   }
 }

run/websockets/package.json

@@ -25,6 +25,6 @@
     "google-auth-library": "^8.7.0",
     "got": "^11.8.3",
     "mocha": "^10.2.0",
-    "puppeteer": "^20.8.2"
+    "puppeteer": "^21.0.0"
   }
 }