Update the polkadot-sdk used

Removes `parity-wasm` as a dependency, closing
https://github.com/serai-dex/issues/227 and tidying our `deny.toml`.

This removes the `import-memory` flag from the linker as part of
`parity-wasm`'s usage was to map imports into exports
(5a1128b94b/substrate/client/executor/common/src/runtime_blob/runtime_blob.rs (L91-L142)).

substrate/runtime/src/wasm/system.rs

@@ -73,11 +73,10 @@ impl frame_system::Config for Runtime {
   // We assume `serai-node` will be run using the RocksDB backend
   type DbWeight = frame_support::weights::constants::RocksDbWeight;
   /*
-    Serai does not expose `frame_system::Call` nor does it use transaction extensions. We
-    accordingly have no consequence to using the default weights for these accordingly.
+    Serai does not expose `frame_system::Call`. We accordingly have no consequence to using the
+    default weights for these accordingly.
   */
   type SystemWeightInfo = ();
-  type ExtensionsWeightInfo = ();
 
   // We also don't use `frame_system`'s account system at all, leaving us to bottom these out.
   type AccountData = ();