MNT: (deps): Bump pint from 0.18 to 0.19 in /ci
MNT: (deps): Bump pint from 0.18 to 0.19 in /ci

Bumps [pint](https://github.com/hgrecco/pint) from 0.18 to 0.19.
- [Release notes](https://github.com/hgrecco/pint/releases)
- [Changelog](https://github.com/hgrecco/pint/blob/master/CHANGES)
- [Commits](https://github.com/hgrecco/pint/compare/0.18...0.19)

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

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