MNT: (deps): Bump pydata-sphinx-theme from 0.5.0 to 0.5.1 in /ci
MNT: (deps): Bump pydata-sphinx-theme from 0.5.0 to 0.5.1 in /ci

Bumps [pydata-sphinx-theme](https://github.com/pydata/pydata-sphinx-theme) from 0.5.0 to 0.5.1.
- [Release notes](https://github.com/pydata/pydata-sphinx-theme/releases)
- [Changelog](https://github.com/pydata/pydata-sphinx-theme/blob/master/docs/changelog.rst)
- [Commits](https://github.com/pydata/pydata-sphinx-theme/compare/v0.5.0...v0.5.1)

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