fix: pin pydata_sphinx_theme to get docs to build

[beckermr]

Description

This PR is attempting to fix the docs build. I diffed the logs and noticed a version change on pydata_sphinx_theme, so I am attempting to pin it.

Checklist - did you ...

• Add a file to the news directory (using the template) for the next release's release notes?
• Add / update necessary tests?
• Add / update outdated documentation?

[beckermr]

@conda/builds-tools This PR is ready to go!

[jaimergp]

Thanks @beckermr! I think once https://github.com/conda-incubator/conda-sphinx-theme/releases/tag/0.2.2 goes live we won't need this. Fingers crossed 🤞

[travishathaway]

@beckermr and @jaimergp see:

• Version bump for conda-sphinx-theme 0.2.1 -> 0.2.2 conda#14350

Just pin to conda-sphinx-theme==0.2.2 for now. I'll be releasing a 0.3.0 later that adds support for pydata-sphinx-theme>=0.16.0.

[travishathaway]

Please see requested changes.

[beckermr]

Thank you for the great review and merge @travishathaway!