nix

[TRIVIAL] Set version to 2.4.0-b2 #4719

Job	Run time
dependencies (linux, gcc, Debug)	3m 16s
dependencies (linux, gcc, Release)	2m 10s
dependencies (linux, clang, Debug)	2m 44s
dependencies (linux, clang, Release)	2m 13s
conan	3m 0s
coverage (linux, gcc, Debug)	13m 15s
test (linux, gcc, Debug)	11m 15s
test (linux, gcc, Debug, -Dunity=ON)	7m 51s
test (linux, gcc, Release)	12m 35s
test (linux, gcc, Release, -Dunity=ON)	8m 51s
test (linux, clang, Debug)	9m 13s
test (linux, clang, Debug, -Dunity=ON)	6m 23s
test (linux, clang, Release)	11m 26s
test (linux, clang, Release, -Dunity=ON)	8m 12s
	1h 42m 24s

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