COMP: Gcc13.2 compiler warnings

[hjmjohnson]

Fix compiler warnings issues with python building turned on.

PR Checklist

• [x] No API changes were made (or the changes have been approved)
• [x] No major design changes were made (or the changes have been approved)

[hjmjohnson]

I ran all 3 files through the clang-format-Darwin binary from the build tree, but there are no changes identified.

I don't know how to fix the CI errors that are posted.

[thewtex]

@hjmjohnson please rebase for style fixes

[hjmjohnson]

/azp ITK.macOS.Arm64

[thewtex]

todo: rebase on #4642 after merged.

[hjmjohnson]

@thewtex The failing test is unstable, and has nothing to do with the PR.

This test is unstable Failed

It seems like perhaps the CI does not have access to the file, or the file is corrupt. I don't know how to proceed.

[hjmjohnson]

/azp ITK.macOS.Arm64

[thewtex]

@hjmjohnson patch for the Nifti tests here: https://github.com/InsightSoftwareConsortium/ITK/pull/4659