Update S3 HTML indices for download.pytorch.org

Update S3 HTML indices for download.pytorch.org #3304

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Run time

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Job	Run time
update (whl)	4m 24s
update (whl/test)	4m 2s
update (whl/nightly)	3m 45s
update (whl/lts/1.8)	34s
	12m 45s