build

Update Junit version to address CVE-2020-15250 (#163) #82

Job	Run time
macos (aarch64)	39s
macos (x86_64)	1m 31s
windows (aarch64)	2m 24s
ubuntu (x86, g++-multilib)	36s
windows (x86_64)	2m 59s
ubuntu (x86_64, g++-)	31s
ubuntu (armhf, g++-arm-linux-gnueabihf)	36s
ubuntu (aarch64, g++-aarch64-linux-gnu)	32s
ubuntu (riscv64, g++-riscv64-linux-gnu)	44s
ubuntu (ppc64, g++-powerpc64le-linux-gnu)	31s
ubuntu (mingw32, g++-mingw-w64-i686)	1m 4s
ubuntu (mingw64, g++-mingw-w64-x86-64)	37s
ubuntu (mingwaarch64, clang)	54s
	13m 38s

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