fix(draw_heatmap): correct typo in submodule import (.funtions -> .functions)

[andrewwhitecdw]

Bugfix sweep for packages/draw_heatmap/accvlab/draw_heatmap/__init__.py

Problem

Imports from .funtions, a misspelled submodule name that will raise ModuleNotFoundError when the package is imported.

Fix

Change the import to use the correct submodule name .functions.

- from .funtions import draw_heatmap, draw_heatmap_batched
+ from .functions import draw_heatmap, draw_heatmap_batched

Reasoning

The intended submodule name is almost certainly functions.py; correcting the typo makes the package importable.

[andrewwhitecdw]

Closing this sweep-generated PR: sole commit is missing a valid Signed-off-by trailer. It does not meet the sweep requirements (single signed-off commit).