Fixes #7301

What

This PR fixes the AxiosInstance call signature to correctly type the generic response data.

• The previous type definition allowed incorrect type inference for response data.
• This change ensures that TypeScript properly enforces the generic type when calling AxiosInstance.
• No runtime code is affected, only TypeScript definitions.

How to verify

You can verify the fix locally by linking your modified axios package:

1.In your axios fork:

npm link

2.In a separate test project:

npm link axios

3.Write TypeScript code like:

import axios from 'axios';

async function test() {
  const res = await axios<{ foo: string }>('/test');

  res.data.foo; // OK
  res.data.data; // TypeScript error as expected
}

Run TypeScript compilation:

npx tsc --noEmit