Remove event_loop fixture, as suggested by pytest

tests/test_asyncio/test_lock.py

@@ -104,16 +104,16 @@ async def test_blocking(self, r):
         lock_2 = self.get_lock(r, "foo")
         assert lock_2.blocking
 
-    async def test_blocking_timeout(self, r, event_loop):
+    async def test_blocking_timeout(self, r):
         lock1 = self.get_lock(r, "foo")
         assert await lock1.acquire(blocking=False)
         bt = 0.2
         sleep = 0.05
         lock2 = self.get_lock(r, "foo", sleep=sleep, blocking_timeout=bt)
-        start = event_loop.time()
+        start = asyncio.get_running_loop().time()
         assert not await lock2.acquire()
         # The elapsed duration should be less than the total blocking_timeout
-        assert bt >= (event_loop.time() - start) > bt - sleep
+        assert bt >= (asyncio.get_running_loop().time() - start) > bt - sleep
         await lock1.release()
 
     async def test_context_manager(self, r):