Revert "Set pytest to run in NPY_PROMOTION_STATE=weak_and_warn"

This reverts commit 80c0526. weak_and_warn results in OverflowError in Numpy 1.

Author: tompollard

pyproject.toml

@@ -23,7 +23,6 @@ dynamic = ["version"]
 dev = [
     "pytest >= 7.1.1",
     "pytest-xdist >= 2.5.0",
-    "pytest-env >= 1.1.5",
     "pylint >= 2.13.7",
     "black >= 22.3.0",
     "sphinx >= 4.5.0",