Remove the nose dependency from AWS Signature V4 unit tests.
Replace nose.tools.assert_equal() with unittest.TestCase.assertEqual()
to use the standard library assertion method and avoid requiring nose
for running the test suite.
--- ../tests/unit/auth/test_sigv4.py	2026-10-18 00:56:35.713125544 +0300
+++ ../tests/unit/auth/test_sigv4.py	2026-10-18 00:57:02.002402601 +0300
@@ -24,7 +24,6 @@
 import os
 from tests.compat import unittest, mock
 from tests.unit import MockServiceWithConfigTestCase
-from nose.tools import assert_equal
 
 from boto.auth import HmacAuthV4Handler
 from boto.auth import S3HmacAuthV4Handler
@@ -640,7 +639,7 @@
                 self.expected_signature_version, self.host, auth
             )
         )
-        assert_equal(auth, [self.expected_signature_version], message)
+        self.assertEqual(auth, [self.expected_signature_version], message)
 
 
 class TestS3SigV4OptIn(MockServiceWithConfigTestCase):