Added python-typing_extensions as dependency

Needs python-typing_extensions in deps

>>> import cron_descriptor
Traceback (most recent call last):
  File "<python-input-0>", line 1, in <module>
    import cron_descriptor
  File "/usr/lib/python3.14/site-packages/cron_descriptor/__init__.py", line 26, in <module>
    from .ExpressionDescriptor import ExpressionDescriptor, get_description
  File "/usr/lib/python3.14/site-packages/cron_descriptor/ExpressionDescriptor.py", line 29, in <module>
    from typing_extensions import Unpack
ModuleNotFoundError: No module named 'typing_extensions'

I fixed the .SRCINFO, I made a simple syntax mistake

With 1.4.4, I'm getting the following error when parsing the SRCINFO:

-> Panic occurred in DB operation:failed to parse python-cron-descriptor: Line 13: key "makedepends" can not occur after pkgname: makedepends = python-setuptools