test-core environment fails 8 tests on main from an outdated panel-material-ui

[ghostiee-11]

pixi run -e test-core test-unit fails 8 tests on main, all TypeError: ... got an unexpected keyword argument 'label' plus one upload button label assertion. The env resolves a panel-material-ui older than the label keyword.

lumen/tests/filters/test_base.py::test_widget_filter_explicit_widget
lumen/tests/test_variables.py::test_add_variable_widget
lumen/tests/views/test_panel.py::test_panel_cross_reference_param
...

Not reproducible in test-312, which pins a newer pmui.