dropped python2 #504

Job	Run time
On ubuntu-20.04 with (gcc-7, python-3.9, numpy-1.20)	2m 15s
On ubuntu-20.04 with (gcc-7, python-3.12, numpy-2.0.1)	2m 2s
On ubuntu-20.04 with (gcc-9, python-3.9, numpy-1.20)	2m 3s
On ubuntu-20.04 with (gcc-9, python-3.12, numpy-2.0.1)	2m 7s
On macos-latest with (clang, python-3.9, numpy-1.20)	2m 10s
On macos-latest with (clang, python-3.12, numpy-2.0.1)	2m 16s
On ubuntu-latest with (gcc-10, python-3.10, numpy-1.23)	2m 15s
On ubuntu-latest with (gcc-11, python-3.10, numpy-1.23)	2m 14s
On ubuntu-latest with (gcc-10, python-3.10, numpy-1.23)	2m 17s
On ubuntu-latest with (gcc-11, python-3.10, numpy-1.23)	2m 14s
On ubuntu-latest with (gcc-10, python-3.11, numpy-1.23)	2m 15s
On ubuntu-latest with (gcc-11, python-3.11, numpy-1.23)	2m 13s
On ubuntu-latest with (gcc-12, python-3.11, numpy-1.23)	2m 18s
On ubuntu-latest with (gcc-10, python-3.11, numpy-1.23)	2m 16s
On ubuntu-latest with (gcc-11, python-3.11, numpy-1.23)	2m 15s
On ubuntu-latest with (gcc-12, python-3.11, numpy-1.23)	2m 16s
	35m 26s

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