Replace np.ndarray with npt.NDArray for improved type hinting

[tanishac25]

Description

This PR updates the type hints by replacing np.ndarray with npt.NDArray from numpy.typing. It was necessary because using npt.NDArray is the recommended way to define NumPy arrays in type hints.

Fixes #4512

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #)

Important checks:

Please confirm the following before marking the PR as ready for review:

• - No style issues: nox -s pre-commit
• - All tests pass: nox -s tests
• - The documentation builds: nox -s doctests
• - Code is commented for hard-to-understand areas
• - Tests added that prove fix is effective or that feature works

[agriyakhetarpal]

Thanks, @tanishac25!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.71%. Comparing base (298e306) to head (9b4dcfb).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4899   +/-   ##
========================================
  Coverage    98.71%   98.71%           
========================================
  Files          304      304           
  Lines        23495    23509   +14     
========================================
+ Hits         23193    23207   +14     
  Misses         302      302           

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