Allow boost version < 106600 #452

Job	Run time
ubuntu-20-mpi	21m 58s
Build wheels on ubuntu-latest	23m 5s
ubuntu-20-python3	24m 59s
ubuntu-20-java8 (gcc 9, gcc-9, gcc-9, g++-9)	23m 47s
ubuntu-20-valgrind-unitTest	33m 43s
webassembly	0s
ubuntu-20-java8 (gcc 10, gcc-10, gcc-10, g++-10)	21m 24s
windows-2019-dynamicLink	45m 48s
ubuntu-20-java8 (clang 9, clang-9, clang-9, clang++-9)	17m 54s
windows-2019-staticLink-cs	38m 1s
ubuntu-20-java8 (clang 10, clang-10, clang-10, clang++-10)	18m 29s
ubuntu-20-java8 (clang 11, clang-11, clang-11, clang++-11)	18m 58s
	4h 48m 6s

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