autoreload does not work with notebook files

[singharpit94]

I am using panel 1.3.8 and bokeh 3.3.4 and noticed that when using autoreload option with a notebook does not work anymore though the same works with .py files

Simple Reproducer:

import panel as pn

pn.extension()
pn.pane.Markdown("# Test ").servable()

To reproduce the issue, create a notebook with a cell having the above code and run panel serve --autoreload. Can you please check this?