Spurious lines on violin plot

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#### ALL software version info
```
python 3.11.8 hab00c5b_0_cpython conda-forge
hvplot 0.9.2 pyhd8ed1ab_0 conda-forge
holoviews 1.18.3 pyhd8ed1ab_0 conda-forge
bokeh 3.3.4 pyhd8ed1ab_0 conda-forge
```
#### Description of expected behavior and the observed behavior
The violin plot occasionally produces spurious lines. The same data plotted with box is OK.

#### Complete, minimal, self-contained example code that reproduces the issue

Data file:
[bar.csv](https://github.com/holoviz/hvplot/files/14813272/bar.csv)

This is a stripped down large data file, with the minimal number of items I was able to reproduce this behaviour.
```
# code goes here between backticks
import pandas as pd
import hvplot.pandas
df = pd.read_csv('/tmp/bar.csv')
df.hvplot.violin(by='month')
df.hvplot.box(by='month')
```

#### Stack traceback and/or browser JavaScript console output

#### Screenshots or screencasts of the bug in action

- [ ] I may be interested in making a pull request to address this