Dependencies: Unblock newer versions of Sphinx. CI: Use Python 3.13

.github/workflows/docs.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.12'
+          python-version: '3.13'
       - name: Build docs
         run: |
           cd docs && make check

CHANGES.rst

@@ -6,6 +6,8 @@ Changes
 Unreleased
 ==========
 
+- Dependencies: Unblock newer versions of Sphinx
+
 
 2.1.2 - 2024/02/28
 ==================

common-build/requirements.txt

@@ -9,4 +9,4 @@ sphinx-autobuild==2021.3.14
 # These versions should match the Read The Docs environment (please update if
 # you notice this is not the case)
 setuptools>=41.1.0
-sphinx>=3,<6
+sphinx>=3,<9

docs/requirements.txt

@@ -1,2 +1,2 @@
-sphinx>=3,<6
+sphinx>=3,<9
 crate-docs-theme