Bump sympy from 1.6.2 to 1.7.1 in /src
Bump sympy from 1.6.2 to 1.7.1 in /src

Bumps [sympy](https://github.com/sympy/sympy) from 1.6.2 to 1.7.1.
- [Release notes](https://github.com/sympy/sympy/releases)
- [Commits](https://github.com/sympy/sympy/compare/sympy-1.6.2...sympy-1.7.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
briehl/narrative,kbase/narrative,briehl/narrative,kbase/narrative,briehl/narrative,kbase/narrative,briehl/narrative,briehl/narrative,kbase/narrative,kbase/narrative,briehl/narrative,kbase/narrative,briehl/narrative