Do pass posargs to tox invocation (#3587)

Co-authored-by: Dimitri Papadopoulos Orfanos <3234522+DimitriPapadopoulos@users.noreply.github.com>

Author: yarikoptic

tox.ini

@@ -11,7 +11,7 @@ commands = make check-dictionaries
 [testenv:unitest]
 description = run unit tests
 dependency_groups = dev
-commands = pytest --cov=codespell_lib codespell_lib
+commands = pytest --cov=codespell_lib {posargs} codespell_lib
 
 [testenv:type]
 description = run type checks