tests

Use `plot_param_importances` in backend #961

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Run time

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Job	Run time
lint	44s
test (3.7)	1m 9s
test (3.8)	2m 35s
test (3.9)	2m 30s
test-with-optuna-master	2m 43s
test (3.10)	2m 38s
	12m 19s