Revert doc.yml to where it was

.github/workflows/doc.yml

@@ -8,16 +8,24 @@ permissions:
   contents: read
 
 jobs:
-  build_docs:
-    runs-on: ubuntu-latest
+  doc:
+    strategy:
+      matrix:
+        os: [ ubuntu-latest ]
+        python-version: [ "3.12" ]
+      fail-fast: false
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4  # https://github.com/actions/checkout
-      - uses: actions/setup-python@v5
         with:
-          python-version: 3.13
-          allow-prereleases: true
           # Only a single commit is fetched by default, for the ref/SHA that triggered the workflow.
           # Set fetch-depth: 0 to fetch all history for all branches and tags.
           fetch-depth: 0 # Needed for setuptools_scm to work correctly
-      - run: pip install --upgrade pip setuptools setuptools-scm nox
-      - run: python -m nox --non-interactive --session docs
+      - name: Set up Python
+        uses: actions/setup-python@v5  # https://github.com/actions/setup-python
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install python prerequisites
+        run: pip install -U --user pip setuptools setuptools-scm nox
+      - name: Sphinx documentation build
+        run: python -m nox --non-interactive --session docs

noxfile.py

@@ -1,7 +1,7 @@
 import nox
 
 
-@nox.session(python=['3.13'])
+@nox.session(python=['3.12'])
 def docs(session):
     session.install(
         'sphinx',