lean4: 4.18.0 -> 4.19.0
Release notes:
- https://github.com/leanprover/lean4/releases/tag/v4.19.0
- https://github.com/leanprover/lean4/releases/tag/v4.19.0-rc3
- https://github.com/leanprover/lean4/releases/tag/v4.19.0-rc2
- https://github.com/leanprover/lean4/releases/tag/v4.19.0-rc1