MNT: (deps): Bump scipy from 1.7.2 to 1.7.3 in /ci
MNT: (deps): Bump scipy from 1.7.2 to 1.7.3 in /ci

Bumps [scipy](https://github.com/scipy/scipy) from 1.7.2 to 1.7.3.
- [Release notes](https://github.com/scipy/scipy/releases)
- [Commits](https://github.com/scipy/scipy/compare/v1.7.2...v1.7.3)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Unidata/siphon