Bump scipy from 1.0.0 to 1.3.1 in /graders/python (#1807)
Bump scipy from 1.0.0 to 1.3.1 in /graders/python (#1807)

Bumps [scipy](https://github.com/scipy/scipy) from 1.0.0 to 1.3.1.
- [Release notes](https://github.com/scipy/scipy/releases)
- [Commits](https://github.com/scipy/scipy/compare/v1.0.0...v1.3.1)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
rbessick5/PrairieLearn,mwest1066/PrairieLearn,mwest1066/PrairieLearn,rbessick5/PrairieLearn,mwest1066/PrairieLearn,mwest1066/PrairieLearn,rbessick5/PrairieLearn,rbessick5/PrairieLearn,mwest1066/PrairieLearn,rbessick5/PrairieLearn