fix: suppress a warning on vscode

Author: yuxqiu

truelearn/utils/visualisations/_bubble_plotter.py

@@ -2,7 +2,7 @@
 from typing_extensions import Self
 
 import circlify
-from matplotlib import cm, colors, colormaps, patches
+from matplotlib import cm, colors, colormaps, patches  # type: ignore
 import matplotlib.pyplot as plt
 
 from truelearn.models import Knowledge