MNT: (deps): Bump sphinx-gallery from 0.8.2 to 0.9.0 in /ci
MNT: (deps): Bump sphinx-gallery from 0.8.2 to 0.9.0 in /ci

Bumps [sphinx-gallery](https://github.com/sphinx-gallery/sphinx-gallery) from 0.8.2 to 0.9.0.
- [Release notes](https://github.com/sphinx-gallery/sphinx-gallery/releases)
- [Changelog](https://github.com/sphinx-gallery/sphinx-gallery/blob/master/CHANGES.rst)
- [Commits](https://github.com/sphinx-gallery/sphinx-gallery/compare/v0.8.2...v0.9.0)

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