Flip rpc tests over to use `ExceptionGroup` on new `trio`

tests/test_advanced_streaming.py

@@ -329,7 +329,7 @@ async def inf_streamer(
 
             # close out the stream gracefully
             except trio.ClosedResourceError:
-                print('msgstream closed on streamer side!')
+                print('transport closed on streamer side!')
                 assert stream.closed
                 break
         else:

tests/test_child_manages_service_nursery.py

@@ -10,7 +10,6 @@ from contextlib import asynccontextmanager as acm
 
 import pytest
 import trio
-from trio_typing import TaskStatus
 import tractor
 from tractor import RemoteActorError
 from async_generator import aclosing

tests/test_rpc.py

@@ -112,7 +112,7 @@ def test_rpc_errors(reg_addr, to_call, testdir):
         value = err.value
 
         # might get multiple `trio.Cancelled`s as well inside an inception
-        if isinstance(value, trio.MultiError):
+        if isinstance(value, ExceptionGroup):
             value = next(itertools.dropwhile(
                 lambda exc: not isinstance(exc, tractor.RemoteActorError),
                 value.exceptions