Bumped min numpy version to 1.18 #490

Job	Run time
On ubuntu-20.04 with (gcc-7, python-2.7, numpy-1.16)	2m 2s
On ubuntu-20.04 with (gcc-7, python-3.7, numpy-1.16)	8m 43s
On ubuntu-20.04 with (gcc-7, python-3.8, numpy-1.16)	8m 42s
On ubuntu-20.04 with (gcc-7, python-3.9, numpy-1.16)	2m 1s
On ubuntu-20.04 with (gcc-9, python-2.7, numpy-1.16)	2m 0s
On ubuntu-20.04 with (gcc-9, python-3.7, numpy-1.16)	8m 44s
On ubuntu-20.04 with (gcc-9, python-3.8, numpy-1.16)	8m 43s
On ubuntu-20.04 with (gcc-9, python-3.9, numpy-1.16)	2m 2s
On macos-latest with (clang, python-2.7, numpy-1.16)	31s
On macos-latest with (clang, python-3.7, numpy-1.16)	25s
On macos-latest with (clang, python-3.8, numpy-1.16)	47s
On macos-latest with (clang, python-3.9, numpy-1.16)	48s
On ubuntu-latest with (gcc-10, python-3.10, numpy-1.22)	8m 44s
On ubuntu-latest with (gcc-11, python-3.10, numpy-1.22)	8m 45s
On ubuntu-latest with (gcc-10, python-3.10, numpy-1.23)	8m 44s
On ubuntu-latest with (gcc-11, python-3.10, numpy-1.23)	8m 43s
On ubuntu-latest with (gcc-10, python-3.11, numpy-1.22)	8m 44s
On ubuntu-latest with (gcc-11, python-3.11, numpy-1.22)	8m 45s
On ubuntu-latest with (gcc-12, python-3.11, numpy-1.22)	8m 44s
On ubuntu-latest with (gcc-10, python-3.11, numpy-1.23)	8m 42s
On ubuntu-latest with (gcc-11, python-3.11, numpy-1.23)	8m 43s
On ubuntu-latest with (gcc-12, python-3.11, numpy-1.23)	8m 41s
	2h 12m 43s

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