Update version tag in CHANGELOG for Dropbox backend

Author: funkyshu

contrib/backend/dropbox/CHANGELOG.md

@@ -6,6 +6,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-## [v1.0.0] - 2025-01-30
+## [contrib/backend/drepbox/v1.0.0] - 2025-01-30
 ### Added
 - Initial commit of dropbox community-contributed backend.