Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-09-28 21:58 fe840598

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feat(set_theory/game/pgame): ditch restricted (#15037) We ditch pgame.restricted. The docstring erroneously claimed it to be something other than what it was, and in its current form, it really only served as a worse form of le_def. It was barely used anyways. See also my comments on Zulip.

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