Bumped min numpy version to 1.18 #503

Job	Run time
On ubuntu-20.04 with (gcc-7, python-3.9, numpy-1.20)	11m 3s
On ubuntu-20.04 with (gcc-7, python-3.12, numpy-2.0.1)	11m 17s
On ubuntu-20.04 with (gcc-9, python-3.9, numpy-1.20)	10m 23s
On ubuntu-20.04 with (gcc-9, python-3.12, numpy-2.0.1)	10m 26s
On macos-latest with (clang, python-3.9, numpy-1.20)	19m 29s
On macos-latest with (clang, python-3.12, numpy-2.0.1)	18m 25s
On ubuntu-latest with (gcc-10, python-3.10, numpy-1.23)	9m 50s
On ubuntu-latest with (gcc-11, python-3.10, numpy-1.23)	9m 51s
On ubuntu-latest with (gcc-10, python-3.10, numpy-1.23)	9m 49s
On ubuntu-latest with (gcc-11, python-3.10, numpy-1.23)	9m 53s
On ubuntu-latest with (gcc-10, python-3.11, numpy-1.23)	9m 59s
On ubuntu-latest with (gcc-11, python-3.11, numpy-1.23)	9m 51s
On ubuntu-latest with (gcc-12, python-3.11, numpy-1.23)	10m 17s
On ubuntu-latest with (gcc-10, python-3.11, numpy-1.23)	10m 19s
On ubuntu-latest with (gcc-11, python-3.11, numpy-1.23)	9m 47s
On ubuntu-latest with (gcc-12, python-3.11, numpy-1.23)	10m 9s
	3h 0m 48s

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