chore: use external injective-testing

Author: mmeloni

contracts/injective-cosmwasm-mock/Cargo.toml

@@ -27,6 +27,7 @@ cosmwasm-std       = { workspace = true }
 cw-storage-plus    = { workspace = true }
 cw2                = { workspace = true }
 injective-cosmwasm = { path = "../../packages/injective-cosmwasm" }
+injective-testing  = { workspace = true }
 injective-math     = { version = "0.3.5-1"}
 injective-std      = { workspace = true }
 prost              = { workspace = true }
@@ -36,4 +37,3 @@ thiserror          = { workspace = true }
 
 [dev-dependencies]
 injective-test-tube = { workspace = true }
-injective-testing   = { path = "../../packages/injective-testing" }