autofix: fixes from CI

Author: benjie

.cachedValidUrls.json

@@ -389,6 +389,7 @@
   "https://www.rabbitmq.com/",
   "https://www.sterblue.com/",
   "https://www.supersaas.co.uk/schedule/Benjie/One_on_One",
+  "https://www.sylvera.com/",
   "https://www.the-guild.dev/",
   "https://www.typescriptlang.org/play",
   "https://yarnpkg.com/lang/en/docs/selective-version-resolutions/"