fix: use correct pydantic le constraint for element_bits

[shuofengzhang]

What changed

• Replaced lte=64 with le=64 in QuantizationBin.element_bits (distillkit/compression/config.py).

Why

• In Pydantic v2, le is the valid keyword for "less than or equal" constraints.
• lte is treated as an extra/unknown Field argument, which triggers a deprecation warning and does not enforce the intended bound.
• This change preserves the intended validation behavior (element_bits <= 64) and removes the warning noise.

Testing

• ✅ source .venv/bin/activate && pytest -q
  • Result: 10 passed in 3.20s

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Note

Low Risk
Low risk: a one-line Pydantic field constraint fix that restores the intended element_bits <= 64 validation and removes deprecation/extra-arg warnings.

Overview
Fixes QuantizationBin.element_bits validation by replacing the Pydantic field constraint lte=64 with le=64, ensuring the <= 64 bound is actually enforced under Pydantic v2 and avoiding extra/unknown Field-arg warnings.

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