Add missing `bokeh_sampledata`

[krassowski]

Reference Issues or PRs

With new bokeh version the example app no longer works as it requires bokeh_sampledata to be installed for this import to work:

from bokeh.sampledata import iris

See https://docs.bokeh.org/en/latest/docs/reference/sampledata.html#bokeh-sampledata

And alternative approach would be to replace it with penguin data as in:

• https://github.com/bokeh/bokeh/pull/13749

What does this implement/fix?

Put a x in the boxes that apply

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds a feature)
• [ ] Breaking change (fix or feature that would cause existing features not to work as expected)
• [ ] Documentation Update
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no API changes)
• [ ] Build related changes
• [ ] Other (please describe):

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