Handle CF_RETURNS_[NOT_]RETAINED in methods #3387

Job	Run time
Check formatting	12s
Check MSRV	1m 0s
Lint macOS x86_64	4m 3s
Lint iOS ARMv7s	4m 15s
Lint visionOS Aarch64 simulator	4m 11s
Lint GNUStep + exceptions	1m 32s
Lint header-translator	34s
Lint test-assembly	27s
Test macOS 15 Aarch64	1m 51s
Assembly tests	56s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Verify header translator output	2m 54s
Check framework features	0s
Test Compiler-RT	27s
Test GNUStep with libobjc2 v1.9	1m 3s
Compiler UI	49s
Test GNUStep with libobjc2 v2.0	1m 14s
Test on iOS simulator w. dinghy	0s
Test GNUStep with libobjc2 v2.1 on nightly	1m 4s
Test GNUStep 32bit	1m 20s
	27m 52s

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