Correct issue with GoogleProvider getUserByToken() method

[ChengKaiChiang]

Calling getUserByToken twice from GoogleProvider will result in obtaining null value for the second call. If you directly use getContents() from GuzzleHttp\Psr7\Stream to retrieve values, after the first retrieval, you need to execute seek(0) to reset the pointer position to the beginning. This is necessary for the second retrieval to work properly. __toString() handles this internally.

Scenario :
When using the GuzzleHttp\Client class, I've implemented a LogMiddleware. This middleware is primarily for logging the request body and response body of each API call. Consequently, during logging, getContents is executed once, leading to getContents during the return of getUserByToken actually receiving null.