🧪 Stop installing pytest-forked @ cibuildwheel

It was originally removed from other places in #658. But the
`cibuildwheel` was overlooked. This patch corrects that.

Author: webknjaz

pyproject.toml

@@ -143,7 +143,7 @@ profile = "True"
 [tool.cibuildwheel]
 build-frontend = "build"
 # container-engine = "podman"  # FIXME?
-test-requires = "pytest pytest-cov pytest-xdist pytest-forked"
+test-requires = "pytest pytest-cov pytest-xdist"
 test-command = "python -Im pytest -m smoke --no-cov {project}/tests"
 skip = "pp*"