Set version to 2.4.0-rc2 #5266

Job	Run time
dependencies (linux, gcc, Debug)	3m 23s
instrumentation-build	17m 2s
dependencies (linux, gcc, Release)	2m 19s
dependencies (linux, clang, Debug)	2m 54s
dependencies (linux, clang, Release)	2m 18s
conan	3m 10s
test (linux, gcc, Debug)	11m 28s
coverage (linux, gcc, Debug)	13m 40s
test (linux, gcc, Debug, -Dunity=ON)	8m 14s
test (linux, gcc, Release)	12m 25s
test (linux, gcc, Release, -Dunity=ON)	8m 30s
test (linux, clang, Debug)	9m 40s
test (linux, clang, Debug, -Dunity=ON)	6m 39s
test (linux, clang, Release)	11m 39s
test (linux, clang, Release, -Dunity=ON)	8m 17s
	2h 1m 38s

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