[ISSUE] venv installed packages stopped working with jupyter lab

[Eloitor <Eloitor@users.noreply.github.com>]

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New issue by Eloitor on void-packages repository

https://github.com/void-linux/void-packages/issues/49402

Description:
### Is this a new report?

Yes

### System Info

Void 6.6.22_1 x86_64 GenuineIntel uptodate hold rFFFFFFFFFFFFFFFFFFFFFFFFFFFFF

### Package(s) Affected

python3-3.12.2_2, jupyterlab-4.0.12_1

### Does a report exist for this bug with the project's home (upstream) and/or another distro?

https://github.com/marimo-team/marimo/issues/968

### Expected behaviour

I install a package in a python venv following the instuctions from 
and after activating it I can use it in jupyter lab. https://github.com/void-linux/void-packages/issues/47135#issuecomment-1826828577

This worked for me before but no longer works??? I don't know what happened...

### Actual behaviour

An installed package with venv is available to use in jupyter lab (after activating the environment)

### Steps to reproduce

1. Install jupyterlab
```
python -m venv --system-site-packages ~/venv
git clone https://github.com/gdamjan/hello-world-python-package.git
cd hello-world-python-package
~/venv/bin/pip install -e .
cd ..
. ~/venv/bin/activate
jupyter lab
```

In jupyter lab

```
from cool_lib import a
```