Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-06-27 16:25 68e01601

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chore(data/int/cast): redo #14890, moving field-specific lemmas (#14995) In #14894, I want to refer to the rational numbers in the definition of a field, meaning we can't have algebra.field.basic in the transitive imports of data.rat.defs. Apparently this dependency was re-added, so I'm going to have to split it again...

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