Update S3 HTML indices for download.pytorch.org

Update S3 HTML indices for download.pytorch.org #2924

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Run time

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Job	Run time
update (whl/lts/1.8) / linux-job	1m 26s
update (whl/nightly) / linux-job	4m 38s
update (whl/test) / linux-job	2m 26s
update (whl) / linux-job	3m 53s
	12m 23s