Merge pull request #359 from madsmtm:sendability-attributes #2168

Job	Run time
Check MSRV	1m 34s
Check formatting	13s
Lint macOS 64bit	3m 55s
Lint iOS 32bit	1m 12s
Lint GNUStep + exceptions	2m 16s
Lint header-translator	45s
Lint test-assembly	37s
Test macOS 12	6m 14s
Compiler UI	1m 36s
Verify header translator output	1m 6s
Assembly tests	1m 23s
Test GNUStep with libobjc2 v1.9	3m 7s
Test GNUStep with libobjc2 v2.0	2m 21s
Test GNUStep with libobjc2 v2.1 on nightly	3m 15s
Test GNUStep 32bit	3m 25s
Check icrate features	0s
Test Compiler-RT	1m 1s
${{ matrix.name }}	0s
Test on iOS simulator w. dinghy	0s
	34m 0s

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