Fix pytest 9 error (elastic#3152)

* Fix pytest 9 error

* Use explicit pytest_asyncio fixture

* Revert "Fix pytest 9 error"

This reverts commit 019e747.

* Fix lint

* Fix lint better

* Add back type ignore

(cherry picked from commit 3a15e1b)

# Conflicts:
#	test_elasticsearch/test_async/test_server/conftest.py

Author: pquentin

test_elasticsearch/test_async/test_server/conftest.py

@@ -15,7 +15,6 @@
 #  specific language governing permissions and limitations
 #  under the License.
 
-import pytest
 import pytest_asyncio
 
 import elasticsearch
@@ -43,7 +42,7 @@ async def async_client_factory(elasticsearch_url):
             await client.close()
 
 
-@pytest.fixture(scope="function")
+@pytest_asyncio.fixture(scope="function")
 def async_client(async_client_factory):
     try:
         yield async_client_factory