Test error: Distributed call failed in min-dep-os

Describe the bug

/Users/runner/work/MONAI/MONAI/monai/transforms/io/array.py:213: UserWarning: required package for reader PILReader is not installed, or the version doesn't match requirement.
Traceback (most recent call last):
  warnings.warn(
  File "/Users/runner/work/MONAI/MONAI/tests/utils.py", line 541, in _wrapper
/Users/runner/work/MONAI/MONAI/monai/transforms/io/array.py:213: UserWarning: required package for reader ITKReader is not installed, or the version doesn't match requirement.
  warnings.warn(
/Users/runner/work/MONAI/MONAI/monai/transforms/io/array.py:213: UserWarning: required package for reader NrrdReader is not installed, or the version doesn't match requirement.
  warnings.warn(
/Users/runner/work/MONAI/MONAI/monai/transforms/io/array.py:213: UserWarning: required package for reader PydicomReader is not installed, or the version doesn't match requirement.
  warnings.warn(
/Users/runner/work/MONAI/MONAI/monai/transforms/utils.py:561: UserWarning: Num foregrounds 27, Num backgrounds 0, unable to generate class balanced samples, setting `pos_ratio` to 1.
  warnings.warn(
    assert results.get(), "Distributed call failed."
AssertionError: Distributed call failed.

To Reproduce

https://github.com/Project-MONAI/MONAI/actions/runs/5455742504/jobs/9927617836?pr=6623

Expected behavior

The test should pass.

Add any other context about the problem here.

Start with the linked GitHub Actions run and tests/utils.py:541, then locate the distributed test that reaches the results.get() assertion. Reproduce the min-dep-os failure and determine why the distributed call returns false; done means the affected CI test passes reliably.