dev-python/celery: remove unused patch

Signed-off-by: Michael Mair-Keimberger <mmk@levelnine.at>

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

@@ -1,31 +0,0 @@
-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):