Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2023-06-05 01:10 533f62f4

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chore(algebraic_geometry/open_immersion): split (#19149) Split algebraic_geometry/open_immersion into a 1000-line file which doesn't mention schemes and a 1000-line file which does. This should open more porting targets (the first file should be available for porting immediately), but also helps towards a reorganization I have in mind for after-port: moving the [pre]sheafed-space and [locally-]ringed-space material from algebraic_geometry into a new folder in topology or geometry.

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