Update cosmwasm-schema requirement from 1.5.3 to 2.0.3

Updates the requirements on [cosmwasm-schema](https://github.com/CosmWasm/cosmwasm) to permit the latest version.
- [Release notes](https://github.com/CosmWasm/cosmwasm/releases)
- [Changelog](https://github.com/CosmWasm/cosmwasm/blob/v2.0.3/CHANGELOG.md)
- [Commits](CosmWasm/cosmwasm@v1.5.3...v2.0.3)

---
updated-dependencies:
- dependency-name: cosmwasm-schema
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -15,7 +15,7 @@ incremental = false
 
 [workspace.dependencies]
 cosmwasm-std = { version = "1.5.3" }
-cosmwasm-schema = { version = "1.5.3" }
+cosmwasm-schema = { version = "2.0.3" }
 cw-controllers = { version = "1.1.2" }
 cw-storage-plus = "1.2.0"
 thiserror = { version = "1.0.50" }