test_prevent_dtype_int fails in mindeps github test

[veenstrajelmer]

tests/test_xarray_helpers.py::test_prevent_dtype_int fails after updating hydrolib-core minimal version in branch of #890. But since that is the only difference (also after comparing environment dependency versions), this cannot be the issue. Check again with testcase that runs on main branch.

It succeeded in main, but failed again after another PR. See if this happens more often, but not always so it is a bit arbitrary.

[veenstrajelmer]

prevent_dtype_int and its test were removed in #943 because they became redundant. Therefore, this issue can be closed.