upgrade Sphinx to 9.2.0 release (#1120)

Author: jmckenna

.github/workflows/build.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v7
         with:
-          python-version: 3.13
+          python-version: 3.15
 
       - name: Build docs
         env:

requirements.txt

@@ -1,6 +1,6 @@
 alabaster==1.0.0
-docutils==0.22.4
-sphinx==9.1.0
+docutils==0.23
+sphinx==9.2.0
 sphinx-copybutton==0.5.2
 sphinx_collapse==0.1.4
 sphinxcontrib-jquery==4.1