Fixing pysphinx docs version

[christinahedges]

Fixing the pyproject.toml file to have the correct pydata-sphinx-theme = "==0.8.1" in the correct place.

[christinahedges]

It looks like poetry updated to 1.4.1 this week, and it's causing some issues with continuous integration (e.g. see here). I reverted the PRs I merged this morning (#1282 and #1284) and I'm going to put in some fix for poetry, then I will merge them back in. The tests for those PRs were run before the new poetry version, and so looked good.

[christinahedges]

It looks like as of v1.4.0 poetry has added a new installation method, see here. This seems to not play nicely with our pydata-sphinx-theme installation, and so turning it off in configuration ensures the tests pass. Setting installer.modern-installation to false should give the same behavior from pre v1.4.0.

Because this configuration setting only exists in v1.4.0 or higher, I'm explicitly installing poetry in our github actions as

python -m pip install --upgrade pip 'poetry>=1.4.0'
poetry config installer.modern-installation false

[christinahedges]

It seems like we're getting a ton of timeout messages from our remote tests.