[cosmwasm] update contract (#509)

* contract updated

* add tests for the logic

Author: Dev Kalra

target-chains/cosmwasm/Cargo.lock

@@ -29,7 +29,7 @@ hex = "0.4.2"
 lazy_static = "1.4.0"
 bigint = "4"
 p2w-sdk = { path = "../../../../third_party/pyth/p2w-sdk/rust" }
-pyth-sdk-cw = "0.2.0"
+pyth-sdk = "0.7.0"
 byteorder = "1.4.3"
 
 [dev-dependencies]