[Example] Update colormap access in euler.py to prevent MatplotlibDeprecationWarning

[bluevisor]

Summary

This PR resolves a deprecation warning in euler.py that occurs when running ti example 6. The warning appears as follows: MatplotlibDeprecationWarning: The get_cmap function was deprecated in Matplotlib 3.7 and will be removed in 3.11. Use matplotlib.colormaps[name] or matplotlib.colormaps.get_cmap() or pyplot.get_cmap() instead.

Changes Made

• Updated import statement:

from matplotlib import cm

to

from matplotlib import colormaps

• Replaced:

cmap = cm.get_cmap(cmap_name)

with

cmap = colormaps[cmap_name]

Rationale

This change uses the updated API for accessing colormaps in Matplotlib, ensuring compatibility with Matplotlib 3.7+ and removing the deprecation warning.

Testing

• Verified that the warning is resolved when running ti example 6 with the updated code.
• Confirmed that the colormap functionality remains the same post-update.