Update schemas to v1.3.0. Closes #326 (#327)

Author: garrytrinder

CHANGELOG.md

@@ -9,8 +9,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [1.5.0] - Unreleased
 
+### Changed:
+
+- Snippets: All snippets that reference schemas updated to use `v1.3.0` schema
+
 ## [1.4.0] - 2025-09-24
 
+### Changed:
+
 - Snippets: All snippets that reference schemas updated to use `v1.2.0` schema
 - Updated dependencies