Parachain Template: Prune `AuxStore` bound and corresponding crate dependency (#2303)

This small PR removes an unnecessary trait bound to the `AuxStore` trait
from the Parachain template's `rpc.rs` file.

With that bound removed, the entire dependency on `sc-client-api` can
also be removed.

---------

Co-authored-by: Joshy Orndorff <git-user-email.h0ly5@simplelogin.com>
Co-authored-by: Bastian Köcher <git@kchr.de>

cumulus/parachain-template/node/src/rpc.rs

@@ -9,7 +9,6 @@ use std::sync::Arc;
 
 use parachain_template_runtime::{opaque::Block, AccountId, Balance, Nonce};
 
-use sc_client_api::AuxStore;
 pub use sc_rpc::{DenyUnsafe, SubscriptionTaskExecutor};
 use sc_transaction_pool_api::TransactionPool;
 use sp_api::ProvideRuntimeApi;
@@ -36,7 +35,6 @@ pub fn create_full<C, P>(
 where
 	C: ProvideRuntimeApi<Block>
 		+ HeaderBackend<Block>
-		+ AuxStore
 		+ HeaderMetadata<Block, Error = BlockChainError>
 		+ Send
 		+ Sync