https://numpy.org/devdocs/reference/generated/numpy.fix.html

the Upstream workflow should start failing soon with

FAILED dask/array/tests/test_array_core.py::test_arithmetic - DeprecationWarning: numpy.fix is deprecated. Use numpy.trunc instead, which is faster and follows the Array API standard.

and possibly a few more. I guess numpy nightly wheels are lagging behind git tip a bit so CI is not failing just yet.