Relicense dispatch2 under Zlib as well #3389

Job	Run time
Check formatting	15s
Check MSRV	57s
Lint macOS x86_64	3m 49s
Lint iOS ARMv7s	4m 3s
Lint visionOS Aarch64 simulator	4m 12s
Lint GNUStep + exceptions	1m 28s
Lint header-translator	30s
Lint test-assembly	26s
Test macOS 15 Aarch64	2m 19s
Verify header translator output	2m 44s
Assembly tests	51s
${{ ((matrix.test && 'Test') \|\| 'Build') }} ${{ matrix.name }}	0s
Check framework features	0s
Test Compiler-RT	24s
Test GNUStep with libobjc2 v1.9	2m 37s
Compiler UI	44s
Test GNUStep with libobjc2 v2.0	1m 8s
Test on iOS simulator w. dinghy	0s
Test GNUStep with libobjc2 v2.1 on nightly	2m 6s
Test GNUStep 32bit	1m 11s
	29m 44s

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