Unpin pytest-xdist (psf#3772)

Author: hauntsaninja

test_requirements.txt

@@ -1,6 +1,6 @@
 coverage >= 5.3
 pre-commit
 pytest >= 6.1.1
-pytest-xdist >= 2.2.1, < 3.0.2
-pytest-cov >= 2.11.1
+pytest-xdist >= 3.0.2
+pytest-cov >= 4.1.0
 tox