Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-10-07 21:39 fa8b7ba2

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chore(topology/*): use dot notation for is_open.prod and is_closed.prod (#4510)

Estimated changes

added theorem is_closed.prod
deleted theorem is_closed_prod
added theorem is_open.prod
deleted theorem is_open_prod