correct version number for the 2.4.2 release #2020

Job	Run time
build on fedora:38 (gcc, false)	4m 25s
build on ubuntu:23.10 (gcc,false)	1m 28s
build on fedora:38 (clang, false)	1m 57s
build on macos (macos-latest)	1m 17s
build on ubuntu:23.10 (clang,false)	1m 23s
build on fedora:37 (gcc, false)	1m 45s
build on macos (macos-latest-xlarge)	1s
build on ubuntu:23.04 (gcc,false)	1m 17s
build on fedora:37 (clang, false)	1m 56s
build on ubuntu:23.04 (clang,false)	1m 24s
build on centos:7 (gcc, true)	1m 46s
build on ubuntu:22.04 (gcc,false)	1m 9s
build on ubuntu:22.04 (clang,true)	1m 26s
build on ubuntu:20.04 (gcc,false)	1m 22s
build on ubuntu:20.04 (clang,false)	1m 31s
build on ubuntu:18.04 (gcc,false)	1m 9s
build on ubuntu:16.04 (gcc,false)	1m 7s
build on ubuntu:14.04 (gcc,false)	1m 9s
build on debian:12 (gcc,false)	1m 28s
build on debian:12 (clang,false)	1m 35s
build on debian:11 (gcc,false)	1m 20s
build on debian:11 (clang,false)	1m 29s
build on debian:10 (gcc,false)	1m 21s
run unit tests (ubuntu:22.04, clang)	38s
run unit tests (centos:7, gcc)	48s
	36m 11s

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