Bump scipy from 1.6.3 to 1.7.0

Bumps [scipy](https://github.com/scipy/scipy) from 1.6.3 to 1.7.0.
- [Release notes](https://github.com/scipy/scipy/releases)
- [Commits](scipy/scipy@v1.6.3...v1.7.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

requirements.txt

@@ -1,5 +1,5 @@
 numpy==1.20.3
-scipy==1.6.3
+scipy==1.7.0
 FireWorks==1.9.7
 pymatgen-analysis-diffusion==2021.4.29
 monty==2021.6.10