Backport PR #45195 on branch 1.4.x (BLD: updated pydata-sphinx-theme to master in environment.yml)
Backport PR #45195: BLD: updated pydata-sphinx-theme to master in environment.yml
hmm don't we need to update github actions here to have 1.4 backports run?

cc @lithomas1  > hmm don't we need to update github actions here to have 1.4 backports run?

will do after #45201 is merged. i *think* may need to rebase this to trigger all the CI
 oh nvm
it worked