feat(bokeh): implement box-grouped (#5994)

## Implementation: `box-grouped` - python/bokeh

Implements the **python/bokeh** version of `box-grouped`.

**File:** `plots/box-grouped/implementations/python/bokeh.py`

**Parent Issue:** #2017

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:robot: *[impl-generate
workflow](https://github.com/MarkusNeusinger/anyplot/actions/runs/25534872121)*

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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Markus Neusinger <2921697+MarkusNeusinger@users.noreply.github.com>

Author: github-actions[bot]

plots/box-grouped/implementations/python/bokeh.py

@@ -1,7 +1,7 @@
-""" pyplots.ai
+""" anyplot.ai
 box-grouped: Grouped Box Plot
-Library: bokeh 3.8.1 | Python 3.13.11
-Quality: 91/100 | Created: 2025-12-25
+Library: bokeh 3.9.0 | Python 3.13.13
+Quality: 80/100 | Updated: 2026-05-08
 """
 
 import numpy as np