v0.20.0-pre.3

What's Changed

• Node to Enum-based design for type-safe IR by @antimora in #4019
• Ignore number_prefix advisory from tokenizers by @laggui in #4037
• BUG: Fixed burn version by @Marc-AnthonyG in #4035
• Refactor/dtype cubecl by @nathanielsimard in #4032
• Fix parallel spelling error. by @crutcher in #4046
• Refactor MetricEntry by @Charles23R in #4031
• Bump actions/checkout from 5 to 6 by @dependabot[bot] in #4047
• Refactor of burn fusion and burn cubecl fusion by @nathanielsimard in #4044
• update cubecl by @louisfd in #4045
• Cleanup autodiff unused roots by @laggui in #4039
• Fix autotuner by @nathanielsimard in #4049
• Combined PRs by @github-actions[bot] in #4059
• Fix floating point norm test tolerance by @laggui in #4061
• Add support for yolo12x model variant check by @antimora in #4048
• Chore: Prepare pre-release 3 by @nathanielsimard in #4060