pinned_drop: Use located_at instead of allowing unused_qualifications… #3050

Job	Run time
test (1.56)	1m 26s
test (stable)	37s
test (beta)	44s
test (nightly)	2m 3s
check-external-types / check-external-types	17s
docs / docs	19s
miri / miri	1m 1s
deny / deny	16s
msrv / prepare	2s
tidy / tidy	1m 4s
msrv / build (ubuntu-latest)	6m 31s
msrv / build (windows-latest)	8m 9s
	22m 29s

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