[Task]: Dataframe API notebook - remove custom install

### What needs to happen?

Right now, we're custom installing Beam latest in our Dataframe notebook - https://github.com/apache/beam/blob/5c3d64747733747ba1f39fdf2c3877e733825e1f/examples/notebooks/beam-ml/dataframe_api_preprocessing.ipynb?short_path=1907d0f#L100 - once 2.43 is released we should update to just install 2.43 directly.

### Issue Priority

Priority: 2

### Issue Component

Component: dsl-dataframe

Open examples/notebooks/beam-ml/dataframe_api_preprocessing.ipynb and inspect the installation cell around the linked line. Replace the custom Beam installation with a direct install of version 2.43, then run the notebook to confirm the installation and preprocessing workflow still work.

Written by the indexing model from the issue text.