build(deps): bump numpy from 2.4.4 to 2.4.6 in /search-api

[saagpatel]

Summary

• Bump NumPy from 2.4.4 to 2.4.6 for the search API runtime.
• Keep the rest of the search API dependency set unchanged.

Verification

• python3 -m pip index versions numpy
• isolated venv install of numpy==2.4.6
• NumPy float32/dot smoke
• git diff --check
• pnpm audit --audit-level moderate

Risk

• Runtime dependency patch bump; Search API health and dependency/security CI lanes should carry the final merge decision.