Update fern definition (#4655)

Author: fern-support

fern/apis/fai/openapi.json

@@ -6628,7 +6628,6 @@
         "type": "string",
         "enum": [
           "claude-4-sonnet",
-          "command-a-03-2025",
           "claude-4.5-haiku",
           "claude-4.5-sonnet"
         ],