(chore): upgrade versions to latest (VapiAI#171)

Co-authored-by: fern-api[bot] <115122769+fern-api[bot]@users.noreply.github.com>

Author: fern-api[bot]

fern/fern.config.json

@@ -1,4 +1,4 @@
 {
   "organization": "vapi",
-  "version": "0.50.16"
+  "version": "0.51.4"
 }