Set version to 2.4.0-b1 #4474

Job	Run time
dependencies (linux, gcc, Debug)	3m 32s
dependencies (linux, gcc, Release)	2m 23s
dependencies (linux, clang, Debug)	2m 59s
dependencies (linux, clang, Release)	2m 35s
coverage (linux, gcc, Debug)	13m 34s
conan	3m 12s
test (linux, gcc, Debug)	11m 34s
test (linux, gcc, Debug, -Dunity=ON)	8m 25s
test (linux, gcc, Release)	12m 12s
test (linux, gcc, Release, -Dunity=ON)	8m 46s
test (linux, clang, Debug)	9m 25s
test (linux, clang, Debug, -Dunity=ON)	6m 41s
test (linux, clang, Release)	11m 24s
test (linux, clang, Release, -Dunity=ON)	8m 38s
	1h 45m 20s

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