Update fern definition (#1416)

Co-authored-by: eyw520 <[email protected]>

Author: dsinghvi

fern/apis/fai/openapi.json

@@ -474,7 +474,7 @@
           }
         },
         "x-fern-audiences": [
-          "internal"
+          "customers"
         ],
         "security": [
           {
@@ -2026,7 +2026,7 @@
           }
         },
         "x-fern-audiences": [
-          "internal"
+          "customers"
         ],
         "security": [
           {