fix: update metadata version (#2507)

* fix: update metadata version

* chore: update CHANGELOG

Author: AlexD10S

CHANGELOG.md

@@ -10,6 +10,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Use marker trait for finding ink! storage `struct` during code analysis - [2499](https://github.com/use-ink/ink/pull/2499)
 
+### Fixed
+- Update metadata version to version 6 ‒ [#2507](https://github.com/use-ink/ink/pull/2507)
+
 ## Version 6.0.0-alpha
 
 This is our first alpha release for ink! v6. We release it together

crates/metadata/src/lib.rs

@@ -73,7 +73,7 @@ use serde::{
 ///
 /// The serialized metadata format (which this represents) is different from the
 /// version of this crate or the contract for Rust semantic versioning purposes.
-const METADATA_VERSION: u64 = 5;
+const METADATA_VERSION: u64 = 6;
 
 /// An entire ink! project for metadata file generation purposes.
 #[derive(Debug, Serialize, Deserialize, JsonSchema)]