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### What problem does this PR solve? Aliyun OSS do not support boto s4 signature_version which will lead to an error: ``` botocore.exceptions.ClientError: An error occurred (InvalidArgument) when calling the PutObject operation: aws-chunked encoding is not supported with the specified x-amz-content-sha256 value ``` According to aliyun oss docs, oss_conn need to use s3 signature_version. ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue)