Add 2.1 feature gate to WriteAcknowledgement

Author: chipshort

contracts/ibc-reflect/Cargo.toml

@@ -30,7 +30,7 @@ cranelift = ["cosmwasm-vm/cranelift"]
 
 [dependencies]
 cosmwasm-schema = { path = "../../packages/schema" }
-cosmwasm-std = { path = "../../packages/std", features = ["iterator", "stargate", "cosmwasm_2_0"] }
+cosmwasm-std = { path = "../../packages/std", features = ["iterator", "stargate", "cosmwasm_2_1"] }
 schemars = "0.8.12"
 serde = { version = "1.0.103", default-features = false, features = ["derive"] }
 

packages/std/src/ibc.rs

@@ -63,6 +63,7 @@ pub enum IbcMsg {
     },
     /// Acknowledges a packet that this contract received over IBC.
     /// This allows acknowledging a packet that was not acknowledged yet in the `ibc_packet_receive` call.
+    #[cfg(feature = "cosmwasm_2_1")]
     WriteAcknowledgement {
         /// Existing channel where the packet was received
         channel_id: String,