Fix audio duration types

Author: RobertCraigie

openapi.yaml

@@ -11331,7 +11331,7 @@ components:
                     type: string
                     description: The language of the input audio.
                 duration:
-                    type: string
+                    type: float
                     description: The duration of the input audio.
                 text:
                     type: string
@@ -11414,7 +11414,7 @@ components:
                     type: string
                     description: The language of the output translation (always `english`).
                 duration:
-                    type: string
+                    type: float
                     description: The duration of the input audio.
                 text:
                     type: string
@@ -17548,4 +17548,4 @@ x-oaiMeta:
                 path: create
               - type: object
                 key: CreateCompletionResponse
-                path: object
+                path: object