Bump scipy from 1.7.0 to 1.7.1 in /extra_requirements

Bumps [scipy](https://github.com/scipy/scipy) from 1.7.0 to 1.7.1.
- [Release notes](https://github.com/scipy/scipy/releases)
- [Commits](scipy/scipy@v1.7.0...v1.7.1)

---
updated-dependencies:
- dependency-name: scipy
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

extra_requirements/requirements-tests.txt

@@ -22,7 +22,7 @@ psutil==5.8.0                                   # Strax dependency
 pytest==6.2.4
 pytest-cov==2.12.1
 scikit-learn==0.24.2
-scipy==1.7.0                                    # Strax dependency
+scipy==1.7.1                                    # Strax dependency
 tensorflow==2.5.1
 tqdm==4.62.0
 xarray==0.19.0