[BUG] nanobind messages

[yurivict]

Environment

**Operating System: FreeBSD 14.2
**Version / Commit SHA: 12.0.1
**Other: nanobind-2.4.0

Describe the bug

The first example from this page prints nanobind messages:

$ python3.11 x.py 
nanobind: leaked 1 instances!
 - leaked instance 0x10dc3cf17e90 of type "openvdb.Transform"
nanobind: leaked 1 keep_alive records!
nanobind: leaked 2 types!
 - leaked type "Axis"
 - leaked type "openvdb.Transform"
nanobind: leaked 23 functions!
 - leaked function "postTranslate"
 - leaked function "preRotate"
 - leaked function "preTranslate"
 - leaked function "worldToIndex"
 - leaked function "__init__"
 - leaked function "postShear"
 - leaked function "__getstate__"
 - leaked function "voxelSize"
 - leaked function ""
 - leaked function "__ne__"
 - leaked function "preShear"
 - ... skipped remainder
nanobind: this is likely caused by a reference counting issue in the binding code.

To Reproduce

1. Build
2. Run example

Expected behavior

(A clear and concise description of what you expected to happen.)

Additional context

(Add any other context about the problem here.)