Add @thirdweb-dev/api to ignored dependencies in knip.json

Updated the knip.json configuration to include @thirdweb-dev/api in the ignoreDependencies list for the dashboard app.

Author: 0xFirekeeper

apps/dashboard/knip.json

@@ -8,6 +8,7 @@
   ],
   "ignoreBinaries": ["only-allow"],
   "ignoreDependencies": [
+    "@thirdweb-dev/api",
     "@thirdweb-dev/service-utils",
     "@thirdweb-dev/vault-sdk",
     "thirdweb",