Update S3 HTML indices for download.pytorch.org

Update S3 HTML indices for download.pytorch.org #3307

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Run time

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Job	Run time
update (whl)	2m 57s
update (whl/test)	2m 36s
update (whl/nightly)	8m 21s
update (whl/lts/1.8)	21s
	14m 15s