Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-01-11 13:55 be4c5aa4

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feat(scripts/lint_mathlib): implement github annotations for mathlib linters (#11345) Resolves the last part of #5863 This causes lean --run lint_mathlib --github to produce error messages understood by github actions, which will tag the lines causing linter failures with annotations in the files changed tab

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