[BUG] typescrypt-axios generated api's response.data type is AxiosPromise<void>

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

Refer below example code:

const sendEmail = (data:openapi.EmailApiModel) =>{
    
    const emailinput:openapi.EmailserviceModelInput = {}
    emailinput.emaildata =  data
    const businesskey = "mykey"
    let apiresult:openapi.EmailserviceModelOutput = {}


    emailservice.emailservicePost(businesskey,emailinput).then((emailresult)=>{
      
      apiresult = emailresult.data // error
    })
 }

The vscode can't allow me use the emailresult.data perfectly, I need to modify the generated code as below image

After above modification VSCode no more complaint.

openapi-generator version

I use openapi-generator-cli 6.5.0 (Mac)

Reproduce the issue by generating a TypeScript Axios client with openapi-generator-cli 6.5.0 and inspect the generated method's response type. Compare the declared response.data type with the endpoint's model output; done when the generated client exposes the expected response type without manual edits and the reproduction is covered by an appropriate generator test.