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#### Describe the issue
I can't post FormData since `"axios": "^0.25.0",`

`Error: Request failed with status code 400`

#### Example Code
```js
export const client = axios.create({
        baseURL: URL_API,
        withCredentials: true,
        responseType: 'json',
	timeout: 30000,
});

const params = new FormData();

params.append('name', data.model);
params.append('idFuel', data.idFuel);
params.append('power', data.idPower);

client.post(`/app/society/${idSociety}/vehicle`, params, { headers: { "Content-Type": "multipart/form-data" } })
```

#### Expected behavior, if applicable
That it works

#### Environment
 - Axios Version: 0.25.0
 - Node.js Version: v14.17.6
 - OS: iOS 15, Android 11 (But on all platforms and versions)
 - Additional Library Versions: React Native 0.64.3

#### Additional context/Screenshots
No problem with  `"axios": "^0.24.0",`

I saw this PR https://github.com/axios/axios/pull/3757 on 0.25.0, but I don't know what I have to change in code.

Thanks for your help 👍

index.d.ts
seEncoding?: responseEncoding | string;
  xsrfCookieName?: string;
  xsrfHeaderName?: string;
  onUploadProgress?: (progressEvent: any) => void;
  onDownloadProgress?: (progressEvent: any) => void;
  maxContentLength?: number;
  validateStatus?: ((status: number) => boolean) | null;
  maxBodyLength?: number;
  maxRedirects?: number;
  socketPath?: string | null;
  httpAgent?: any;
  httpsAgent?: any;
  proxy?: AxiosProxyConfig | false;
  cancelToken?: CancelToken;
  decompress?: boolean;
  transitional?: TransitionalOptions;
  signal?: AbortSignal;
  insecureHTTPParser?: boolean;
}
export interface HeadersDefaults {
  common: AxiosRequestHeaders;
  delete: AxiosRequestHeaders;
  get: AxiosRequestHeaders;
  head: AxiosRequestHeaders;
  post: AxiosRequestHeaders;
  put: AxiosRequestHeaders;
  patch: AxiosRequestHeaders;
  options?: AxiosRequestHeaders;
  purge?: AxiosRequestHeaders;
  link?: AxiosRequestHeaders;
  unlink?: AxiosRequestHeaders;
}
export interface AxiosDefaults<D = any> extends Omit<AxiosRequestConfig<D>, 'headers'> {
  headers: HeadersDefaults;
}
export interface AxiosResponse<T = any, D = any>  {
  data: T;
  status: number;
  statusText: string;
  headers: AxiosResponseHeaders;
  config: AxiosRequestConfig<D>;
  request?: any;
}
export interface AxiosError<T = any, D = any> extends Error {
  config: AxiosRequestConfig<D>;
  code?: string;
  request?: any;
  response?: AxiosResponse<T, D>;
  isAxiosError: boolean;
  toJSON: () => object;
}
export interface AxiosPromise<T = any> extends Promise<AxiosResponse<T>> {
}
export interface CancelStatic {
  new (message?: string): Cancel;
}
export interface Cancel {
  message: string | undefined;
}
export interface Canceler {
  (message?: string): void;
}
export interface CancelTokenStatic {
  new (executor: (cancel: Canceler) => void): CancelToken;
  source(): CancelTokenSource;
}
export interface CancelToken {
  promise: Promise<Cancel>;
  reason?: Cancel;
  throwIfRequested(): void;
}
export interface Cance