Bump the project version from 1.5.4 to 1.6.0 #741

Job	Run time
linux-gcc-code-coverage	44m 33s
address-sanitizer	45m 56s
Intel Mac-Clang-specific-preinstalled	52m 26s
Intel Mac-Clang-from-source	55m 59s
Apple Silicon Mac-Clang-from-source	57m 59s
Apple Silicon Mac-Clang-specific-preinstalled	58m 46s
arm64-cross-compilation	4m 26s
linux-aarch64-cross-compilation	5m 52s
linux-build-gcc-static	2m 45s
Intel Mac-Clang-deps-off	48m 56s
arm32-cross-compilation	5m 49s
undefined-behavior-sanitizer	45m 39s
linux-thread-size-check	3m 43s
Ubuntu 22.04-gcc-curl	42m 47s
Ubuntu 24.04-gcc-curl	42m 1s
Apple Silicon Mac-Clang-deps-off	59m 31s
Ubuntu 20.04-gcc-curl	43m 10s
Ubuntu 20.04-gcc-lws	3m 46s
cmake-flags-test	30s
Ubuntu 22.04-gcc-lws	3m 22s
Ubuntu 24.04-gcc-lws	3m 23s
	10h 31m 19s

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