Only pass SSE headers for multipart upload requests #81
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This PR fixes akka/alpakka#2906, Alpakka created a regression whereby their latest Alpakka BSL release (4.0.0) has multipart upload broken.
According to S3 docs (see https://docs.aws.amazon.com/AmazonS3/latest/API/API_CompleteMultipartUpload.html#API_CompleteMultipartUpload_Examples), you are not allowed to have any other headers that is not SSE related.
I tested this on my companies S3 account and I can confirm that it passes.