Bump scipy from 1.4.1 to 1.5.2

Bumps [scipy](https://github.com/scipy/scipy) from 1.4.1 to 1.5.2.
- [Release notes](https://github.com/scipy/scipy/releases)
- [Commits](https://github.com/scipy/scipy/compare/v1.4.1...v1.5.2)