The theme does not match the original colors

[Vanerio]

Description

Hi,
The extension does not match GitHub original colors.
It happens for both day and night themes.

For example, this Python file:
Left: original | Right: VS Code
You can see even green brackets, not blue attributes and more...

Steps to reproduce

1. Install GitHub Theme
2. Check colors with any file

Version

v6.3.5

Theme

GitHub Dark Default