dev-python/celery: backport sphinx 6.0 patch

Closes: https://bugs.gentoo.org/890883
Signed-off-by: Julien Roy <julien@jroy.ca>

dev-python/celery/files/celery-5.3.0_beta1-sphinx-6.0.patch

@@ -0,0 +1,31 @@
+From 57acb4d0ecb4fcb55daf3bb2d750aa760a81eec6 Mon Sep 17 00:00:00 2001
+From: Mathias Ertl <mati@er.tl>
+Date: Sat, 24 Dec 2022 10:40:19 +0100
+Subject: [PATCH] return list of nodes to make sphinx extension compatible with
+ Sphinx 6.0
+
+---
+ celery/contrib/sphinx.py | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/celery/contrib/sphinx.py b/celery/contrib/sphinx.py
+index a3a06479ccf..a5505ff189a 100644
+--- a/celery/contrib/sphinx.py
++++ b/celery/contrib/sphinx.py
+@@ -32,6 +32,7 @@
+ """
+ from inspect import signature
+ 
++from docutils import nodes
+ from sphinx.domains.python import PyFunction
+ from sphinx.ext.autodoc import FunctionDocumenter
+ 
+@@ -75,7 +76,7 @@ class TaskDirective(PyFunction):
+     """Sphinx task directive."""
+ 
+     def get_signature_prefix(self, sig):
+-        return self.env.config.celery_task_prefix
++        return [nodes.Text(self.env.config.celery_task_prefix)]
+ 
+ 
+ def autodoc_skip_member_handler(app, what, name, obj, skip, options):