Fix client secrets tests for Python 3.12 and newer.
Replace the deprecated and removed unittest.assertEquals() alias
with assertEqual() to maintain compatibility with modern Python
versions while preserving exception argument checks.
--- ../tests/test_clientsecrets.py	2026-10-16 17:29:24.568833116 +0300
+++ ../tests/test_clientsecrets.py	2026-10-16 17:29:37.480964212 +0300
@@ -215,8 +215,8 @@
                 clientsecrets.InvalidClientSecretsError) as exc_manager:
             clientsecrets._loadfile(NONEXISTENT_FILE)
 
-        self.assertEquals(exc_manager.exception.args[1], NONEXISTENT_FILE)
-        self.assertEquals(exc_manager.exception.args[3], errno.ENOENT)
+        self.assertEqual(exc_manager.exception.args[1], NONEXISTENT_FILE)
+        self.assertEqual(exc_manager.exception.args[3], errno.ENOENT)
 
 
 class CachedClientsecretsTests(unittest.TestCase):