MNT: (deps): Bump doc8 from 0.8.1 to 0.9.0 in /ci
MNT: (deps): Bump doc8 from 0.8.1 to 0.9.0 in /ci

Bumps [doc8](https://github.com/pycqa/doc8) from 0.8.1 to 0.9.0.
- [Release notes](https://github.com/pycqa/doc8/releases)
- [Commits](https://github.com/pycqa/doc8/compare/0.8.1...0.9.0)

---
updated-dependencies:
- dependency-name: doc8
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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