MNT: (deps): Bump pep8-naming from 0.11.1 to 0.12.0 in /ci
MNT: (deps): Bump pep8-naming from 0.11.1 to 0.12.0 in /ci

Bumps [pep8-naming](https://github.com/PyCQA/pep8-naming) from 0.11.1 to 0.12.0.
- [Release notes](https://github.com/PyCQA/pep8-naming/releases)
- [Changelog](https://github.com/PyCQA/pep8-naming/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/PyCQA/pep8-naming/compare/0.11.1...0.12.0)

---
updated-dependencies:
- dependency-name: pep8-naming
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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