Add python 3.9 tests & advertise python 3.9 support #265
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This PR adds python 3.9 tests & advertise python 3.9 support.
I had failures with numpy tests on python 3.9 only thus I bumped the numpy version. This lead to timeouts on arm64 => switch to arm64-graviton2 for aarch64, always running on focal so also changed to focal as default distro. python 3.7 is missing on focal for ppc64le, s390x => use python 3.8 for non amd64 arch.