Fix broken workflow dependency updates

[Copilot]

• Inspect the current NER normalization changes and dependency pins
• Check for a Python 3.11-compatible, non-vulnerable scikit-learn version
• Restore the original sklearn.preprocessing imports and normalization calls in NER
• Add a compatible scikit-learn pin back to NER requirements
• Re-run NER lint, Docker build, and unit tests
• Summarize whether the original custom function was equivalent and what was changed