dev-python/blinker: Remove obsolete patch

Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-python/blinker/files/blinker-1.4-pytest.patch

@@ -1,31 +0,0 @@
-From 8238e16c699ce7f99f5ff3f80d03d332d72015f8 Mon Sep 17 00:00:00 2001
-From: pgajdos <pgajdos@suse.cz>
-Date: Wed, 8 Jul 2020 15:22:19 +0200
-Subject: [PATCH] use pytest instead of deprecated nose
-
----
- tests/test_signals.py | 4 ++--
- 1 file changed, 2 insertions(+), 2 deletions(-)
-
-diff --git a/tests/test_signals.py b/tests/test_signals.py
-index 2d6a65a..e74db47 100644
---- a/tests/test_signals.py
-+++ b/tests/test_signals.py
-@@ -4,7 +4,7 @@
- 
- import blinker
- 
--from nose.tools import assert_raises
-+import pytest
- 
- 
- jython = sys.platform.startswith('java')
-@@ -227,7 +227,7 @@ def receiver(sender, **kw):
-         pass
-     sig = blinker.Signal()
- 
--    assert_raises(TypeError, sig.connect, receiver)
-+    pytest.raises(TypeError, sig.connect, receiver)
-     assert not sig.receivers
-     assert not sig._by_receiver
-     assert sig._by_sender == {blinker.base.ANY_ID: set()}