Prepare for v3.8.3 release (#1355)

Bump version to 3.8.3 and finalize changelog for release.

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: AlexV525 <[email protected]>

Author: Copilot

CHANGELOG.md

@@ -8,6 +8,10 @@ To know more about breaking changes, see the [Migration Guide][].
 
 ## Unreleased
 
+*None.*
+
+## 3.8.3
+
 **Fixes**
 
 - Fix all media assets being returned when `filterOption` is not specified instead of respecting the requested type.

pubspec.yaml

@@ -1,7 +1,7 @@
 name: photo_manager
 description: A Flutter plugin that provides album assets abstraction management APIs on Android, iOS, macOS, and OpenHarmony.
 repository: https://github.com/fluttercandies/flutter_photo_manager
-version: 3.8.2
+version: 3.8.3
 
 environment:
   sdk: ">=2.13.0 <4.0.0"