Bump minimum SymPy version and add Python 3.9 to CI

Same as pystencils!208 (merged)

added 3 commits

• 837d714d...6374f339 - 2 commits from branch pycodegen:master
• 68f31ae1 - Merge branch 'master' of i10git.cs.fau.de:pycodegen/lbmpy into minimal_sympy

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• 6da2b605 - Added latest python pipeline

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• dd21623b - parallelised ubuntu pipeline

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• 15c7a2af - Skip llvmlite test case

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• e8829a85 - testing

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• ee5d0a9b - Remove system wide sympy

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• d122e62c - Add -y to remove

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• 6fe01781 - Add numpy again

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• 4997634f - Clean up
• c9fe5efd - Skipp pycuda notebooks if pycuda is not installed

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• f812ff31 - Remove coverage report

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• 145fcb4e - Remove cuda11 tag from latest python

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• 39879f21 - Remove coverage report from latest python pipeline

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• d2196eba - Adapted CI

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• c20b3c06 - install matplotlib

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• 695a6cf5 - minimum numpy is 1.11

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• a137e791 - pip3 as in pystencils CI

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• ba781484 - restore some info

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• d118518d - again

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changed title from Minimal sympy to Bump minimum SymPy version and add Python 3.9 to CI

merged