get rid of openmm warning #895

Job	Run time
Test on py3.9/macOS-latest	11m 28s
Run fast checks over code	8s
Test on py3.10/macOS-latest	12m 6s
Test on py3.11/macOS-latest	11m 32s
Test on py3.12/macOS-latest	11m 55s
Test on py3.9/ubuntu-latest	9m 35s
Test on py3.10/ubuntu-latest	10m 0s
Test on py3.11/ubuntu-latest	9m 55s
Test on py3.12/ubuntu-latest	9m 48s
Test on py3.9/macOS-13	20m 42s
Test on py3.10/macOS-13	15m 32s
Test on py3.11/macOS-13	25m 26s
Test on py3.12/macOS-13	14m 48s
Packaging py${{ matrix.python-version }}/${{ matrix.os }}	0s
Test installing py${{ matrix.python-version }}/${{ matrix.os }}	0s
	2h 42m 55s

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