Update subxt dependencies (paritytech#2072)

Author: serban300

relays/client-rialto-parachain/Cargo.toml

@@ -8,7 +8,7 @@ license = "GPL-3.0-or-later WITH Classpath-exception-2.0"
 [dependencies]
 codec = { package = "parity-scale-codec", version = "3.1.5" }
 scale-info = { version = "2.5.0", default-features = false, features = ["derive"] }
-subxt = { version = "0.27.1", default-features = false, features = [] }
+subxt = { version = "0.28.0", default-features = false, features = [] }
 
 # Bridge dependencies