Bumped min numpy version to 1.18 #509

Job	Run time
On ubuntu-20.04 with (gcc-7, python-3.9, numpy-1.20)	11m 0s
On ubuntu-20.04 with (gcc-7, python-3.12, numpy-2.0.1)	11m 10s
On ubuntu-20.04 with (gcc-9, python-3.9, numpy-1.20)	10m 24s
On ubuntu-20.04 with (gcc-9, python-3.12, numpy-2.0.1)	10m 24s
On macos-latest with (clang, python-3.9, numpy-1.20)	18m 6s
On macos-latest with (clang, python-3.12, numpy-2.0.1)	18m 26s
On ubuntu-latest with (gcc-10, python-3.10, numpy-1.23)	9m 48s
On ubuntu-latest with (gcc-11, python-3.10, numpy-1.23)	9m 16s
On ubuntu-latest with (gcc-10, python-3.10, numpy-1.23)	9m 53s
On ubuntu-latest with (gcc-11, python-3.10, numpy-1.23)	9m 43s
On ubuntu-latest with (gcc-10, python-3.11, numpy-1.23)	9m 47s
On ubuntu-latest with (gcc-11, python-3.11, numpy-1.23)	9m 43s
On ubuntu-latest with (gcc-12, python-3.11, numpy-1.23)	10m 5s
On ubuntu-latest with (gcc-10, python-3.11, numpy-1.23)	9m 47s
On ubuntu-latest with (gcc-11, python-3.11, numpy-1.23)	9m 44s
On ubuntu-latest with (gcc-12, python-3.11, numpy-1.23)	10m 9s
	2h 57m 25s

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