Fix test failures

- migrate away from deprecated get_event_loop
- try ignoring warnings due to unclosed _UnixSubprocessTransport not
being closed when subprocess is killed for some reason

servo/cli.py

@@ -2056,7 +2056,13 @@ def run_async(future: Union[asyncio.Future, asyncio.Task, Awaitable]) -> Any:
     Raises:
         Exception: Any exception raised during execution of the future.
     """
-    return asyncio.get_event_loop().run_until_complete(future)
+    try:
+        return asyncio.get_running_loop().run_until_complete(future)
+    except RuntimeError as e:
+        if str(e) == "no running event loop":
+            return asyncio.run(future)
+        else:
+            raise
 
 
 def print_table(table, headers) -> None:

setup.cfg

@@ -23,6 +23,7 @@ filterwarnings =
     ignore: unclosed resource <UVProcessTransport .*:ResourceWarning
     ignore: subprocess \d+ is still running:ResourceWarning
     ignore: unclosed transport <_UnixSubprocessTransport .*:ResourceWarning
+    ignore: Event loop is closed:RuntimeError
     ignore:The --rsyncdir command line argument and rsyncdirs config variable are deprecated.:DeprecationWarning
     ignore: Deprecated call to `pkg_resources\.declare_namespace.*:DeprecationWarning
     ignore: pkg_resources is deprecated as an API:DeprecationWarning