Fix/staticmethod callable python 3 10 #2263

[leonor-p]

Motivation

ManimGL fails to import on Python < 3.10 with TypeError: 'staticmethod' object is not callable.

Multiple functions across the codebase are declared with @staticmethod
and then used as decorators on other methods inside the same class body.
Prior to Python 3.10, staticmethod objects were not callable, making
this pattern invalid.

Fixes #2263

Proposed changes

• Removed @staticmethod from note_undrawn_event in manimlib/window.py
• Removed @staticmethod from affects_data, affects_family_data, stash_mobject_pointers, affects_shader_info_id in manimlib/mobject/mobject.py
• Removed @staticmethod from affects_mobject_list in manimlib/scene/scene.py
• Fixed @lru_cache to @lru_cache() in manimlib/shader_wrapper.py

Test

Code:
python -c "from manimlib import *"

Result: Import completes successfully on Python 3.9.25 with no TypeError.
The ffmpeg RuntimeWarning is expected and unrelated to this fix.

Before:

After: