Update for pydata-sphinx-theme 0.12.0

`pydata-sphinx-theme` updated, renaming some configuration names.
(only one of which we actually configure)
While they are just warnings for now, we are configured to error on
warning so CircleCI is indicating failure.

This does the 'easy' route of just changing to the new name and expecting
the version in which it is implemented.

If desired, I could do a larger change to accomodate both by checking
the version, but I'm also not _too_ worried about more tightly pinning
already relatively tight requirements.

Author: ksunden

doc/conf.py

@@ -403,7 +403,7 @@ def js_tag_with_cache_busting(js):
              "image_light": "images/logo2.svg",
              "image_dark": "images/logo_dark.svg"},
     "navbar_end": ["theme-switcher", "version-switcher", "mpl_icon_links"],
-    "page_sidebar_items": "page-toc.html",
+    "secondary_sidebar_items": "page-toc.html",
 }
 include_analytics = is_release_build
 if include_analytics:

requirements/doc/doc-requirements.txt

@@ -13,7 +13,7 @@ ipython
 ipywidgets
 numpydoc>=1.0
 packaging>=20
-pydata-sphinx-theme>=0.11.0
+pydata-sphinx-theme>=0.12.0
 mpl-sphinx-theme
 sphinxcontrib-svg2pdfconverter>=1.1.0
 sphinx-gallery>=0.10