Fix requirements on values in `NSSet` and keys in `NSDictionary` #2217

Job	Run time
Check formatting	17s
Check formatting	17s
Check MSRV	1m 52s
Check MSRV	1m 52s
Lint macOS 64bit	4m 31s
Lint macOS 64bit	4m 31s
Lint iOS 32bit	1m 23s
Lint iOS 32bit	1m 23s
Lint GNUStep + exceptions	1m 45s
Lint GNUStep + exceptions	1m 45s
Lint header-translator	39s
Lint header-translator	39s
Lint test-assembly	34s
Lint test-assembly	34s
Test macOS 12	9m 27s
Test macOS 12	9m 27s
Verify header translator output	1m 3s
Verify header translator output	1m 3s
Compiler UI	1m 54s
Compiler UI	1m 54s
Test Compiler-RT	39s
Test Compiler-RT	39s
Assembly tests	1m 10s
Assembly tests	1m 10s
Test GNUStep with libobjc2 v1.9	2m 1s
Test GNUStep with libobjc2 v1.9	1m 53s
Test GNUStep with libobjc2 v2.0	1m 43s
Test GNUStep with libobjc2 v2.0	2m 10s
Test GNUStep with libobjc2 v2.1 on nightly	1m 59s
Test GNUStep with libobjc2 v2.1 on nightly	2m 12s
Test GNUStep 32bit	3m 15s
Test GNUStep 32bit	2m 12s
Check icrate features	0s
Check icrate features	0s
Test on iOS simulator w. dinghy	0s
Test on iOS simulator w. dinghy	0s
${{ matrix.name }}	0s
${{ matrix.name }}	0s
	1h 7m 53s

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