fix httpx

Signed-off-by: emdneto <9735060+emdneto@users.noreply.github.com>

Author: emdneto

instrumentation/opentelemetry-instrumentation-httpx/tests/test_httpx_integration.py

@@ -98,12 +98,7 @@ def _is_url_tuple(request: "RequestInfo"):
 
 
 def _async_call(coro: typing.Coroutine) -> asyncio.Task:
-    loop = asyncio.new_event_loop()
-    asyncio.set_event_loop(loop)
-    try:
-        return loop.run_until_complete(coro)
-    finally:
-        loop.close()
+    return asyncio.run(coro)
 
 
 def _response_hook(span, request: "RequestInfo", response: "ResponseInfo"):