Fix include line for IO Cython modules

[vyasr]

Description

This PR ensures that numpy include directories are visible to the cuIO Cython TUs. #12096 changed the way that numpy was being found but did not update this line. The old variable is automatically being created by scikit-build's Python code, so as long as skbuild correctly finds the libraries the old variable still works, but we do not want to rely on that since it is not true in all environments.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[bdice]

How does this relate to the comment below? Does something else need changed/updated?

cudf/python/cudf/cudf/_lib/CMakeLists.txt

Lines 82 to 84 in 2a5411a

	target_include_directories(${target} PRIVATE "${NumPy_INCLUDE_DIRS}")
	# Switch to the line below when we switch back to FindPython.cmake in CMake 3.24.
	# target_include_directories(${target} PRIVATE "${Python_NumPy_INCLUDE_DIRS}")

[vyasr]

How does this relate to the comment below? Does something else need changed/updated?

cudf/python/cudf/cudf/_lib/CMakeLists.txt

Lines 82 to 84 in 2a5411a

	target_include_directories(${target} PRIVATE "${NumPy_INCLUDE_DIRS}")
	# Switch to the line below when we switch back to FindPython.cmake in CMake 3.24.
	# target_include_directories(${target} PRIVATE "${Python_NumPy_INCLUDE_DIRS}")

That comment is referring to the changes I made to _lib/CMakeLists.txt in the wheels PR. This PR is updating _lib/io/CMakeLists.txt, which was relying on the variables that were previously populated by the old find_package call in _lib/CMakeLists.txt. I changed one call without changing the other.

[codecov]

Codecov Report

Base: 88.25% // Head: 88.25% // No change to project coverage 👍

Coverage data is based on head (c83ff55) compared to base (0c60819).
Patch has no changes to coverable lines.

Additional details and impacted files

@@              Coverage Diff              @@
##           branch-22.12   #12250   +/-   ##
=============================================
  Coverage         88.25%   88.25%           
=============================================
  Files               137      137           
  Lines             22571    22571           
=============================================
  Hits              19921    19921           
  Misses             2650     2650           

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