remove unnecessary type:ignore

Author: mrnicegyu11

opentelemetry-api/tests/context/base_context.py

@@ -64,7 +64,7 @@ def test_attach(self):
             self.assertEqual("yyy", context.get_value("a"))
 
             with self.assertLogs(level=ERROR):
-                context.detach("some garbage")  # type:ignore
+                context.detach("some garbage")
 
         def test_detach_out_of_order(self):
             t1 = context.attach(context.set_value("c", 1))