Pin to numpy<2 to avoid spacy compat issues

[ayushdg]

Description

Fixes current CI test failures: https://github.com/NVIDIA/NeMo-Curator/actions/runs/9544784088/job/26340303080?pr=117

Usage

N/A

Checklist

• [X] I am familiar with the Contributing Guide.
• [X] New or Existing tests cover these changes.
• [X] The documentation is up to date with these changes.

[ryantwolf]

Good with me. The NeMo Framework container has been using numpy 1.24 so nothing should break there.