Bump minimum SymPy version and add Python 3.9 to CI

Most other projects' policy appears to be to only set version requirements when a certain version is explicitly needed. E.g. we need sympy.diff from 1.2, so we should set that as the minimum. Ideally, we should have a CI job with that minimum version too, but we certainly shouldn't disallow using a version just because it's not in CI as long as there are no known incompatibilities.

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• b61ede9a - Implement new pipeline for minimal version

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Please set pystencils' minimum numpy version to 1.11, which we need for numpy.moveaxis, and pin that version in the new CI job. You do not need to set versions in lbmpy as it inherits them from pystencils. lbmpy currently specifies a minimum sympy version of 1.1, which you can thus remove. Then, add the same job to the lbmpy project.

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• 5b56cb17 - Adapted minimal numpy version

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• 2a929460 - Find sympy and numpy dynamically

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mentioned in merge request lbmpy!57 (merged)

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• dff8cae0 - Increase numpy version

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• aa443179 - Added latest python pipeline

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• 7b750b5d - Parallelised ubuntu pipeline

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• 8b767abd - Remove coverage report

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• b55f9bfe - Add import skip for pycuda

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• e46c553b - Remove cuda11 tag from latest python

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• 76bae9b2 - Skipp pycuda test cases

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• 2f7290f6 - More pycuda skipping

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• 21408a51 - Remove coverage report from latest python pipeline

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• 1cb8e4f3 - downgrade requirement to numpy 1.7

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• 9859dacc - Minor changes

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• da573ba2 - install matplotlib

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• 7be2fd11 - CI numpy version
• 35c262c1 - Merge branch 'Sympy_minimal' of i10git.cs.fau.de:holzer/pystencils into Sympy_minimal

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• 1bf19ea3 - add figure to plot test case

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• 7c06dcb5 - keep Ubuntu numpy version

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resolved all threads

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• 5d45f99b - minimum numpy is actually 1.8

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

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enabled an automatic merge when the pipeline for 5d45f99b succeeds

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mentioned in commit 2f2fce8a