[Python] Add edges to colorbar in seaborn heatmap

I have the following heatmap:

import seaborn as sns
import matplotlib.pyplot as plt
import numpy as np

# Create a sample heatmap
data = np.random.rand(10, 12)
ax = sns.heatmap(data)


plt.show()


How can I add a black edge to the colormap? Is there any way to do this without needing to use subplots?

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