feature: Python: support new syntax `except*`

[sohang3112]

Did you check the tree-sitter docs?

• I have read all the tree-sitter docs if it relates to using the parser

Is your feature request related to a problem? Please describe.

PEP 654 introduced exception groups: "a combination of multiple unrelated exceptions". This changes how exceptions are handled by the user, where a new variation of the except keyword can be used as except*.

However, code block syntax highlighting does not support it yet, removing the coloring even from the except keyword itself:

try:
    raise ExceptionGroup()
except*:
    pass

This issue was originally raised in markup repo, moved here as it's about syntax highlighting: github/markup#1942

Describe the solution you'd like

Suppory syntax highlighting for new keyword except*.

Describe alternatives you've considered

NA

Additional context

No response