Fix NumPy 1.24+ compatibility: replace deprecated np.float

[Mr-Neutr0n]

Summary

• Replace deprecated NumPy float aliases to support NumPy 1.24+

Changes

• fairseq/modules/dynamic_crf_layer.py: Replace np.float("inf") with float("inf")
• examples/data2vec/models/mae.py: Replace np.float with np.float64

Background

np.float was deprecated in NumPy 1.20 and removed in NumPy 1.24. Using np.float now raises AttributeError: module 'numpy' has no attribute 'float'.

Test plan

• Verified the fix maintains the same behavior
• float("inf") is the correct way to represent infinity
• np.float64 maintains the same precision as the original np.float

Fixes #4945

🤖 Generated with Claude Code

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