Bug#1129166: sympy: FTBFS: E DeprecationWarning: bitcount function is deprecated

[Stuart Prescott]

sympy is also not compatible with mpmath that is currently in sid and 
autopkgtest tests fail on ci.d.n as a result.

https://github.com/sympy/sympy/issues/29231

-- 
Stuart Prescott   http://www.nanonanonano.net/ stuart at nanonanonano.net
Debian Developer  http://www.debian.org/       stuart at debian.org
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