MNT: (deps): Bump matplotlib from 3.3.2 to 3.3.3 in /ci
MNT: (deps): Bump matplotlib from 3.3.2 to 3.3.3 in /ci

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.3.2 to 3.3.3.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](https://github.com/matplotlib/matplotlib/compare/v3.3.2...v3.3.3)

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