Create payloadFromHashAssumes that the request body is either string or byte - throws exceptions for type _io.BufferedReader

[ashishkumar468]

Came across this library when using mlflow.log_artifacts with AWS_SIGV4 request signing enabled. When trying to upload the artifact with a put call, this library throws an exception saying that _io.BufferedReader cannot be encoded. Possible solution (or a better version of it).
At line https://github.com/andrewjroth/requests-auth-aws-sigv4/blob/master/requests_auth_aws_sigv4/__init__.py#L141C14-L141C14

  if r.body:
                if isinstance(r.body, bytes):
                    log.debug("Request Body: <bytes> %s", r.body)
                    payload_hash = hashlib.sha256(r.body).hexdigest()
                elif isinstance(r.body, bytes):
                    log.debug("Request Body: <str> %s", r.body)
                    payload_hash = hashlib.sha256(r.body.encode('utf-8')).hexdigest()
                else
                     log.debug("Request Body Object's instance type: {type(obj)} ")
                     body_buffer=r.body
                     file_content=body_buffer.read()
                     body_buffer.seek(0)
                     payload_hash = payload_hash = hashlib.sha256(file_content).hexdigest()