Python docstring not generated for 3.12 generic syntax

[shyun3]

Describe the bug

Plugin does not seem to support the new syntax for generic functions introduced in Python 3.12. See examples.

Settings

No custom settings.

To Reproduce

Steps to reproduce the behavior:

1. Open a new Python buffer and insert the following snippet:

   def f[T](x: T) -> None:
       pass

2. Move cursor to f and use the Ex command :DogeGenerate

Nothing happens.

Expected behavior

Docstring to be generated.

Output of ./bin/vim-doge-helper --version

vim-doge-helper 4.7.0

Output of vim --version

NVIM v0.11.6
Build type: Release
LuaJIT 2.1.1741730670
Run "nvim -V1 -v" for more info