fix: remove loop argument from asyncio calls

[janLo]

The loop parameter was removed in python 3.10 and causes a TypeError there:

   File "/usr/local/lib/python3.10/site-packages/aioelasticsearch/__init__.py", line 33, in __init__                                                                                                                                                                                                                                                        
     super().__init__(hosts, transport_class=transport_class, **kwargs)                                                                                                                                                                                                                                                                                        
   File "/usr/local/lib/python3.10/site-packages/elasticsearch/client/__init__.py", line 205, in __init__                                                                                                                                                                                                                                                         
     self.transport = transport_class(_normalize_hosts(hosts), **kwargs)                                                                                                                                                                                                                                                                                       
  File "/usr/local/lib/python3.10/site-packages/aioelasticsearch/transport.py", line 74, in __init__                                                                                                                                                                                                                                                       
     self._connection_pool_lock = asyncio.Lock(loop=self.loop)                                                                                                                                                                                                                                                                                                 
  File "/usr/local/lib/python3.10/asyncio/locks.py", line 77, in __init__                                                                                                                                                                                                                                                                                       
    super().__init__(loop=loop)                                                                                                                                                                                                                                                                                                                                
  File "/usr/local/lib/python3.10/asyncio/mixins.py", line 17, in __init__                                                                                                                                                                                                                                                                                      
    raise TypeError(                                                                                                                                                                                                                                                                                                                                         TypeError: As of 3.10, the *loop* parameter was removed from Lock() since it is no longer necessary 

Are there changes in behavior for the user?

It might not work as expected anymore if the user tries to use a loop that is not the defauult loop for the current thread - but it seems that this is not supported by python anymore anyway.

Related issue number

None to my knowledge.

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add a new news fragment into the CHANGES folder
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    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
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