ContributeFix AttributeError in C1_W3_Lab01

[EggXiaolu]

Problem

Due to a recent matplotlib update, the CheckButtons object no longer includes the rectangles attribute, causing:

AttributeError: 'CheckButtons' object has no attribute 'rectangles'

Fix

• Kept the original support for rectangles;
• Added compatibility for the new boxes attribute;
• Used conditional checks to handle both cases dynamically;

Fix issues: #61