Update toolchain

[eyihluyc]

Update from lean4:v4.11.0 to lean4:v4.12.0-rc1.

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PR-Codex overview

This PR introduces changes related to unused variables in the Lean codebase.

Detailed summary

• Updated UnusedVariables linter options in various files
• Reordered arguments in Mem and IsAttached inductive definitions
• Modified substitute and incLocatorsFrom functions
• Updated revisions in lake-manifest.json files

The following files were skipped due to too many changes: Minimal/Calculus.lean

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[0crat]

@eyihluyc As per our policy, naming Git branches like "update-toolchain" isn't recommended and incurs a -12 point penalty. For better practices, name your branch after the ticket number you're addressing, such as "50". This ensures clarity and consistency. Your current balance stands at +4. Let's aim for improvement in future branch naming.

[0crat]

@Anatolay Hey there! 👋 Thanks for your review! You've earned +4 points, which is the minimum according to our policy. We had to deduct some points because there was only 1 comment (we aim for at least 6), but we made sure you got something for your effort. Remember, more comments can boost your points up to +8! Your current balance is -16. Keep up the good work and let's aim for more detailed reviews next time! 💪

[0crat]

@eyihluyc Great work on your contribution! 🌟 You've earned +4 points: +4 base, -8 for excess code (442 >= 200), -4 for minimal comments, +12 bonus. Your balance is now -8. Remember, quality matters - keep the contributions coming, focusing on concise code and thorough documentation!