feat: NestedAsyncIO contextmanager (#872)

* feat: NestedAsyncIO contextmanager

This comes from erdewit/nest_asyncio#88
implemented by @CharlieJiangXXX before NestedAsyncIO was archived.

It should help with some issues where the patched eventloop causes
problems with some other libraries, like Discord.py, that do some "odd"
things with eventloops

* fix: remove nest-asyncio from requirements

* fix: adjust ci coverage and 3.12 support

* fix: more loop fixes for 3.12

pydantic_aioredis/model.py

@@ -10,9 +10,8 @@
 from typing import Tuple
 from typing import Union
 
-import nest_asyncio
 from pydantic_aioredis.abstract import _AbstractModel
-from pydantic_aioredis.utils import bytes_to_string
+from pydantic_aioredis.utils import bytes_to_string, NestedAsyncIO
 
 
 class Model(_AbstractModel):
@@ -69,8 +68,8 @@ def __save_from_sync(self):
                 # Use nest_asyncio so we can call the async save
             except RuntimeError:
                 io_loop = asyncio.new_event_loop()
-        nest_asyncio.apply()
-        io_loop.run_until_complete(self.save())
+        with NestedAsyncIO():
+            io_loop.run_until_complete(self.save())
 
     @asynccontextmanager
     async def update(self):