Merge branch 'RemoveWarning' into 'master'

Remove gmpy workaround

See merge request pycodegen/pystencils!255
13 jobs for master in 23 minutes and 33 seconds (queued for 3 seconds)
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riscv64 Test
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Cleaning up file based variables
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arm64v9 Test
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Cleaning up file based variables
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ppc64le Test
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Cleaning up file based variables
ERROR: Job failed: exit code 1