Description: pythontex3 is missing several files needed to run.

The PythonTeX files seem to have moved from texlive-core to texlive-bin in 2023.66984-2, but several were lost in transition so that the pythontex binary no longer works.

Steps to reproduce:

```
$ pythontex
Traceback (most recent call last):
File "/usr/bin/pythontex", line 55, in <module>
import pythontex3 as pythontex
ModuleNotFoundError: No module named 'pythontex3'
```

The complete file list in `/usr/share/texmf-dist/scripts/pythontex` from texlive-core 2023.66587-2 was

```
depythontex2.py
depythontex3.py
depythontex.py
pythontex2.py
pythontex_2to3.py
pythontex3.py
pythontex_engines.py
pythontex_install.py
pythontex.py
pythontex_utils.py
```

All of these have been removed from the latest texlive-core but only `pythontex.py` and `depythontex.py` made it to `texlive-bin`, causing missing import.

Can be worked around by manually copying the missing pythontex files to any directory in PYTHONPATH.

(First timer here, apologies for any missing info on my part. Happy to be educated about anything I should do differently in the future.)