Pin compatible docutils version for Sphinx <= 3.2.1.

Author: JulienPalard

build_docs.py

@@ -95,16 +95,21 @@ def __repr__(self):
 
     @property
     def requirements(self):
-        """Generate the right requirements for this version, pin
-        breaking sub-dependencies, like jinja2, as needed."""
+        """Generate the right requirements for this version, pinning breaking
+        sub-dependencies as needed.
+        """
         reqs = [
             "blurb",
             "jieba",
             f"sphinx=={self.sphinx_version}",
         ]
 
         if version_to_tuple(self.sphinx_version) < (4, 5):
+            # see https://github.com/python/cpython/issues/91294
             reqs += ["jinja2<3.1"]
+        if version_to_tuple(self.sphinx_version) <= (3, 2, 1):
+            # see https://github.com/python/cpython/issues/91483
+            reqs += ["docutils<=0.17.1"]
         return reqs
 
     @property