CI: tox4 is renamed to tox

Author: FRidh

.github/workflows/tox.yml

@@ -27,8 +27,8 @@ jobs:
       - name: Install tox-gh
         run: python -m pip install tox-gh
       - name: Setup test suite
-        run: tox4 r -vv --notest
+        run: tox r -vv --notest
       - name: Run test suite
-        run: tox4 r --skip-pkg-install
+        run: tox r --skip-pkg-install
         env:
           PYTEST_ADDOPTS: "-vv --durations=10"