Remove typing dependency

[maximdeclercq]

Issue details

Installing typing in Python 3.5 and higher has no effect and might even break pip (as in my case). Refer to this page for more information.

Output of hdl_checker -V: 0.7.4
Python version used: Python 3.10.5
OS: Linux 5.18.14
Compiler and version: GHDL 1.0.0 (tarball) [Dunoon edition]