chore: bump version to 1.5.3

Author: ZhuJHua

flutter_map_cache/pubspec.yaml

@@ -1,6 +1,6 @@
 name: flutter_map_cache
 description: A slim yet powerful caching plugin for flutter_map tile layers.
-version: 1.5.2
+version: 1.5.3
 repository: https://github.com/josxha/flutter_map_plugins
 issue_tracker: https://github.com/josxha/flutter_map_plugins/issues
 resolution: workspace