Resolve warnings related to numpy 2.0

[paulromano]

Description

Now that NumPy 2.0 has been released, I'm noticing a few more warnings about deprecations in our CI test output. This PR gets rid of these warnings.

Checklist

• I have performed a self-review of my own code
• I have run clang-format (version 15) on any C++ source files (if applicable)
• I have followed the style guidelines for Python source files (if applicable)
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works (if applicable)

[paulromano]

To elaborate on the change with integrate(...), that is a local variable that points to scipy.integrate.simpson, where as of the latest release of SciPy the function signature now expects the x's to be passed as a keyword-only argument.

[pshriwise]

Thanks for staying ahead of the NumPy update @paulromano!