[BUG]: Enable Pybind's ing_ref/dec_ref checking

[dagardner-nv]

Version

25.06

Which installation method(s) does this occur on?

Source

Describe the bug.

In #541 we had to disable this to unblock the adoption of Python 3.12. It would be nice to re-enable this.

Minimum reproducible example

Relevant log output

Full env printout

Other/Misc.

No response

Code of Conduct

• I agree to follow MRC's Code of Conduct
• I have searched the open bugs and have found no duplicates for this bug report