Fix unused import warning #3011

Job	Run time
Check formatting	14s
Check MSRV	1m 6s
Lint macOS 64bit	2m 40s
Lint iOS 32bit	2m 3s
Lint GNUStep + exceptions	1m 34s
Lint header-translator	27s
Lint test-assembly	23s
Test macOS 12	2m 27s
Assembly tests	48s
Verify header translator output	1m 9s
Check framework features	0s
${{ matrix.name }}	0s
Test Compiler-RT	30s
Test GNUStep with libobjc2 v1.9	1m 8s
Test on iOS simulator w. dinghy	0s
Test GNUStep with libobjc2 v2.0	1m 8s
Compiler UI	1m 22s
Test GNUStep with libobjc2 v2.1 on nightly	1m 3s
Test GNUStep 32bit	1m 23s
	19m 25s

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