To get all testing dependencies.

--- pytest-forked-1.6.0/tox.ini.orig
+++ pytest-forked-1.6.0/tox.ini
@@ -16,7 +16,7 @@
   pytest46: pytest~=4.6
   pytest54: pytest~=5.4
   pytest62: pytest~=6.2
-  pytestlatest: pytest
+  pytest
   pytestmain: git+https://github.com/pytest-dev/pytest.git@main
 commands=
   pytest {posargs}