Warning message when runing new planemo version

Hi, I recently updated my planemo (removing old env and creating new one with `conda create -n planemo planemo`)
And no, when I run `planemo l`, it gives a warning at the end:

```
Exception ignored while calling deallocator :
Traceback (most recent call last):
File "/home/nilchia/miniconda3/envs/planemo/lib/python3.14/site-packages/cwl_utils/sandboxjs.py", line 111, in __del__
TypeError: 'NoneType' object is not callable

```