Bump sympy from 1.5.1 to 1.6
Bump sympy from 1.5.1 to 1.6

Bumps [sympy](https://github.com/sympy/sympy) from 1.5.1 to 1.6.
- [Release notes](https://github.com/sympy/sympy/releases)
- [Commits](https://github.com/sympy/sympy/compare/sympy-1.5.1...sympy-1.6)

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