remove unused `_` #5418

Job	Run time
pytester (ubuntu-22.04, 3.10, latest, core)	11m 44s
pytester (ubuntu-22.04, 3.10, latest, ops)	30m 12s
pytester (ubuntu-22.04, 3.10, nightly, core)	11m 46s
pytester (ubuntu-22.04, 3.10, nightly, ops)	30m 4s
pytester (macOS-14, 3.10, latest, core)	8m 13s
pytester (macOS-14, 3.10, latest, ops)	22m 7s
pytester (macOS-14, 3.10, nightly, core)	9m 7s
pytester (macOS-14, 3.10, nightly, ops)	27m 3s
pytester (windows-2022, 3.10, latest, core)	23m 39s
pytester (windows-2022, 3.10, nightly, core)	25m 4s
pytester (ubuntu-22.04, 3.11, latest)	24m 41s
pytester (ubuntu-22.04, 3.12, latest)	28m 5s
testing-guardian	1s
	4h 11m 46s

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