mat2 0.13.3 is unusable with TypeError

When trying to run mat2 on:

$ lsb_release -a
Distributor ID:	Debian
Description:	Debian GNU/Linux 10 (buster)
Release:	10
Codename:	buster

$ python3 --version
Python 3.7.3

I get this traceback :

Traceback (most recent call last):
  File "./mat2", line 4, in <module>
    __import__('pkg_resources').run_script('mat2==0.13.3', 'mat2')
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 666, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 1446, in run_script
    exec(code, namespace, namespace)
  File "/usr/local/lib/python3.7/dist-packages/mat2-0.13.3-py3.7.egg/EGG-INFO/scripts/mat2", line 14, in <module>
    from libmat2 import parser_factory, UNSUPPORTED_EXTENSIONS
  File "/usr/local/lib/python3.7/dist-packages/mat2-0.13.3-py3.7.egg/libmat2/parser_factory.py", line 45, in <module>
    def get_parser(filename: str) -> tuple[Optional[T], Optional[str]]:
TypeError: 'type' object is not subscriptable

Which reminds me of #184 (closed) I guess it's the same kind of issue.