tests

Use XCode 16.4 to fix pod lint #757

Job	Run time
Building macOS libraries	1m 5s
Building Linux libraries	4m 24s
Building Android libraries	4m 6s
Basic WASM build	2m 21s
Build XCFramework	7m 6s
Testing with Valgrind on ubuntu-latest	2m 43s
Rust unit tests on ubuntu-24.04	2m 50s
Building Windows libraries	2m 50s
Rust unit tests on macos-latest	1m 32s
Testing on macos-latest	52s
Testing on windows-11-arm	1m 23s
Testing on ubuntu-arm64	1m 24s
Testing on windows-latest	1m 5s
Testing on ubuntu-24.04	1m 13s
	34m 54s

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