Supporting SSEKMSEncryptionContext when s3 upload extra_arg allow list, Invalid extra_args key 'SSEKMSEncryptionContext', must be one of:

[annguojia]

Hello,

Currently we are using s3transfer to do s3 upload via s3-SSE. However, one issue we found is that s3transfer manager.py not supporting

Traceback (most recent call last):
  File "/opt/amazon/lib/python3.6/site-packages/deepinsight_document_classification/asynchronous/main.py", line 198, in upload_model
    extra_args=extra_args)
  File "/opt/amazon/lib/python3.6/site-packages/deepinsight_document_classification/s3.py", line 59, in upload_file
    self._s3transfer.upload_file(filename, bucket, key, extra_args=extra_args)
  File "/opt/amazon/lib/python3.6/site-packages/boto3/s3/transfer.py", line 277, in upload_file
    filename, bucket, key, extra_args, subscribers)
  File "/opt/amazon/lib/python3.6/site-packages/s3transfer/manager.py", line 304, in upload
    self._validate_all_known_args(extra_args, self.ALLOWED_UPLOAD_ARGS)
  File "/opt/amazon/lib/python3.6/site-packages/s3transfer/manager.py", line 446, in _validate_all_known_args
    kwarg, ', '.join(allowed)))
 "ValueError: Invalid extra_args key 'SSEKMSEncryptionContext', must be one of: ACL, CacheControl, ContentDisposition, ContentEncoding, ContentLanguage, ContentType, Expires, GrantFullControl, GrantRead, GrantReadACP, GrantWriteACP, Metadata, RequestPayer, ServerSideEncryption, StorageClass, SSECustomerAlgorithm, SSECustomerKey, SSECustomerKeyMD5, SSEKMSKeyId, Tagging, WebsiteRedirectLocation"  

Can you please help