Fix AutoreleaseSafe with thread kind auto traits #3147

Job	Run time
Check MSRV	50s
Check formatting	12s
Lint macOS x86_64	2m 32s
Lint iOS ARMv7s	2m 20s
Lint visionOS Aarch64 simulator	2m 19s
Lint GNUStep + exceptions	1m 32s
Lint header-translator	25s
Lint test-assembly	24s
Test macOS 15 Aarch64	1m 16s
Verify header translator output	54s
Assembly tests	56s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Check framework features	0s
Test Compiler-RT	39s
Test GNUStep with libobjc2 v1.9	1m 18s
Test on iOS simulator w. dinghy	0s
Test GNUStep with libobjc2 v2.0	1m 26s
Compiler UI	46s
Test GNUStep with libobjc2 v2.1 on nightly	53s
Test GNUStep 32bit	1m 10s
	19m 52s

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