ML/AutoML: Increase notebook execution timeout from 240 to 300 seconds

FAILED test.py::test_notebook[automl_timeseries_forecasting_with_pycaret.ipynb] -
nbclient.exceptions.CellTimeoutError: A cell timed out while it was
being executed, after 240 seconds.
The message was: Cell execution timed out.

Here is a preview of the cell contents:
-------------------
s = setup(data, fh=15, target="total_sales", index="month", log_experiment=True)

topic/machine-learning/automl/pyproject.toml

@@ -27,7 +27,7 @@ markers = [
 nb_test_files = true
 nb_coverage = false
 # 120 seconds is too less on CI/GHA
-nb_exec_timeout = 240
+nb_exec_timeout = 300
 nb_diff_replace = [
     # Compensate output of `crash`.
     '"/cells/*/outputs/*/text" "\(\d.\d+ sec\)" "(0.000 sec)"',