Removed invalid await from grpc async call

[VanaMartin]

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Changes to Core Features:

This PR only removes invalid await clause from initialising grpc request. The existing await was causing folowing exception (on version 1.11.2):

   2597     if isinstance(shard_key, get_args_subscribed(models.ShardKey)):
   2598         shard_key = RestToGrpc.convert_shard_key(shard_key)
-> 2599     request = await grpc.CreateShardKey(
   2600         shard_key=shard_key,
   2601         shards_number=shards_number,
   2602         replication_factor=replication_factor,
   2603         placement=placement or [],
   2604     )
   2605     return (
   2606         await self.grpc_collections.CreateShardKey(
   2607             grpc.CreateShardKeyRequest(
   (...)
   2611         )
   2612     ).result
   2613 else:

TypeError: object CreateShardKey can't be used in 'await' expression

I've tested the local behaviour with a positive result.

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
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[joein]

Hi @VanaMartin

Thank you for your contribution

However, we can't accept it right now, because async client is auto-generated from sync client and changes to async files can't be done without altering either sync client or generator code

We'll investigate the issue

[joein]

I have found and fixed the issue and extended tests coverage