CreateEditImage method upload file report Supported file formats are 'image/png'

[XuruiPro]

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Describe the bug
CreateEditImage method upload file report Supported file formats are 'image/png'

To Reproduce

config := openai.DefaultConfig("token")
config.HTTPClient = &http.Client{}
c := openai.NewClientWithConfig(config)
f4, _ := os.Open("./4.png")
defer f4.Close()
ctx := context.Background()
reqUrl := openai.ImageEditRequest{
	Image:          f4,
	Prompt:         "添加一只红色的鸭子",
	Model:          openai.CreateImageModelDallE2,
	Size:           openai.CreateImageSize512x512,
	ResponseFormat: openai.CreateImageResponseFormatURL,
	N:              1,
}
respUrl, err := c.CreateEditImage(ctx, reqUrl)
if err != nil {
	fmt.Printf("Image creation error: %v\n", err)
	return
}
fmt.Println(respUrl.Data[0].URL)

Expected behavior
Print out the URL address

Screenshots/Logs
Invalid file 'image': unsupported mimetype ('application/octet-stream'). Supported file formats are 'image/png'.

Environment (please complete the following information):

• go-openai version: [e.g. v1.38.1]
• Go version: [e.g. 1.20]
• OpenAI API version: [e.g. v1]
• OS: [e.g. Windows 10]

Additional context
Add any other context about the problem here.