Update dependencies, Xcode version and minimum deployment target #2326

Job	Run time
Check formatting	15s
Check MSRV	5m 14s
Lint macOS 64bit	1m 15s
Lint iOS 32bit	44s
Lint GNUStep + exceptions	47s
Lint header-translator	31s
Lint test-assembly	26s
Test macOS 12	5m 12s
Verify header translator output	0s
Assembly tests	0s
${{ matrix.name }}	0s
Compiler UI	0s
Check icrate features	0s
Test Compiler-RT	0s
${{ matrix.name }}	0s
Test on iOS simulator w. dinghy	0s
	14m 24s

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