requirements: bump min aiorpcx to 0.22.0

aiorpcx 0.20 changed the behaviour/API of TaskGroups.
When used as a context manager, TaskGroups no longer propagate
exceptions raised by their tasks. Instead, the calling code has
to explicitly check the results of tasks and decide whether to re-raise
any exceptions.
This is a significant change, and so this commit introduces "OldTaskGroup",
which should behave as the TaskGroup class of old aiorpcx. All existing
usages of TaskGroup are replaced with OldTaskGroup.

closes https://github.com/spesmilo/electrum/issues/7446

electrum/interface.py

@@ -38,7 +38,6 @@ import hashlib
 import functools
 
 import aiorpcx
-from aiorpcx import TaskGroup
 from aiorpcx import RPCSession, Notification, NetAddress, NewlineFramer
 from aiorpcx.curio import timeout_after, TaskTimeout
 from aiorpcx.jsonrpc import JSONRPC, CodeMessageError
@@ -47,7 +46,7 @@ import certifi
 
 from .util import (ignore_exceptions, log_exceptions, bfh, MySocksProxy,
                    is_integer, is_non_negative_integer, is_hash256_str, is_hex_str,
-                   is_int_or_float, is_non_negative_int_or_float)
+                   is_int_or_float, is_non_negative_int_or_float, OldTaskGroup)
 from . import util
 from . import x509
 from . import pem
@@ -376,7 +375,7 @@ class Interface(Logger):
         # Dump network messages (only for this interface).  Set at runtime from the console.
         self.debug = False
 
-        self.taskgroup = TaskGroup()
+        self.taskgroup = OldTaskGroup()
 
         async def spawn_task():
             task = await self.network.taskgroup.spawn(self.run())
@@ -675,7 +674,7 @@ class Interface(Logger):
     async def request_fee_estimates(self):
         from .simple_config import FEE_ETA_TARGETS
         while True:
-            async with TaskGroup() as group:
+            async with OldTaskGroup() as group:
                 fee_tasks = []
                 for i in FEE_ETA_TARGETS:
                     fee_tasks.append((i, await group.spawn(self.get_estimatefee(i))))